Which of the following describes how the septum in the heart affects blood flow? a.) It pumps blood out of the heart to the rest of the cardiovascular system when heart muscles contract. b.)It separates the heart's left and right sides to keep oxygenated and deoxygenated blood from mixing. c.)It separates the heart's upper and lower chambers to keep incoming and outgoing blood from mixing. d.) It accepts blood into the heart from the rest of the cardiovascular system when heart muscles relax.

QUESTION POSTED AT 13/11/2019 - 05:21 PM

Related questions

Photochemical smog results from the interaction of pollutants in the presence of a. water vapor. b. oxygen. c. sunlight. d. rainfall.

Photochemical smog results from the interaction of pollutants in the presence of sunlight. The correct option for this question is option “c”. Photochemical smog is a kind of air pollution that occurs due to reaction of certain chemicals present in the air and sunlight. This type of pollution can be seen in places where industries are present in large numbers. Ozone is one component that is a must for the creation of photochemical smog. Ozone is very harmful for any human beings.  


ANSWERED AT 05/12/2019 - 09:46 PM


QUESTION POSTED AT 05/12/2019 - 09:46 PM

Which organelle is critical for glucose production? a. vacuole b. mitochondrion c. chloroplast d. vesicle

The chloroplast is the organelle that is critical for glucose production. 
An organelle is the part of a cell that has a specific purpose in a cell. The structure of the cell is made up of many different organelles.  The chloroplast consists of chlorophyll and the cell wall. The chloroplast helps with photosynthesis. Animal cells do not contain chlorophyll as they do not need photosynthesis to generate energy.  A plant is unable to turn the sun's rays into a food source without photosynthesis.  

ANSWERED AT 05/12/2019 - 09:41 PM


QUESTION POSTED AT 05/12/2019 - 09:41 PM

In what way can open-mindedness interfere with scientific progress? It can prevent the development of new ideas. It can lead to the acceptance of untested ideas. It can lead to too much critical evaluation of ideas. It can prevent the development of scientific consensus.

Open-mindedness does interfere with scientific progress as it can lead to acceptance of untested ideas. Open-mindedness can lead to actually accepting results that are not true. This is not a great angle for people involved with scientific experiments. Open-mindedness should be limited to the fact that the results can lead to negative answers. People that can accept this theory will ultimately succeed in their strive for creating something new. There is nothing wrong in discarding the results that does not seem to fit the bill.


ANSWERED AT 05/12/2019 - 09:41 PM


QUESTION POSTED AT 05/12/2019 - 09:41 PM

Results published in __________ are the most respected in science because they have passed through rigorous evaluation process involving feedback from multiple sources. Choose one answer. a. news magazines b. peer-reviewed journals c. web journals d. weekly newspapers

The answer is B. Peer-reviewed journals.

Results that are peer-reviewed means that they have been checked by scientists who are also experts in the same fields. And that means that the results are reliable.

ANSWERED AT 05/12/2019 - 09:37 PM


QUESTION POSTED AT 05/12/2019 - 09:37 PM

Each lung is fed oxygen by a separate bronchus. Please select the best answer from the choices provided. T F

Answer:

The given statement is true.

At lungs level, trachea segmented into two primary bronchi each entering one lung that is, left primary bronchus enters the left lung and right bronchus enters the right lung.

In each lung, primary bronchi (both left and right) segmented into secondary bronchi and then into tertiary bronchi. Tertiary bronchi then divide into smaller airways termed as bronchioles.

These bronchioles eventually connect with alveoli, specialized sac-like structures which form the site for gas exchange.

Thus, we can conclude that each lung is fed oxygen by a separate bronchus.

ANSWERED AT 05/12/2019 - 09:35 PM


QUESTION POSTED AT 05/12/2019 - 09:35 PM

Which of the following statements is FALSE? a. Stock characters are often stereotypes b. Archetypes can be good or bad c. Every story has a protagonist d. Archetypes play supporting roles and are not central characters

The statement "Archetypes can be good or bad" (b) is the statement that is false amongst the options above.
Archetypes are examples or models. Objects, behaviours and other things are patterned on them. An archetype is an example of model behaviour, a good person, an artifact that helps good triumph over evil etc.  In literature, we find situation archetypes, setting archetypes, symbolic archetypes and character archetypes. In short, a model or pattern for every construct needed to write a story or poem etc. 

ANSWERED AT 05/12/2019 - 09:28 PM


QUESTION POSTED AT 05/12/2019 - 09:28 PM

Genetic drift is best described as the redistribution of the frequency of gene occurrence in a(n) _______. a. population b. organism c. ecosystem d. disaster

The right answer is A. population.

Genetic drift is one of the mechanisms of evolution that leads to the creation of new species from populations of individuals. This mechanism is that of random variation of allelic frequencies within a population and over generations.

ANSWERED AT 05/12/2019 - 09:22 PM


QUESTION POSTED AT 05/12/2019 - 09:22 PM

Some people have freckles, and some people do not have freckles. If a child has freckles, at least one parent has freckles. However, the child may have a sibling that does not have freckles. Which statement best describes the presence of freckles?

For this information to be true, that would mean freckles is a dominant trait, and to not have freckles is a recessive trait. So that means if even someone's genotype has both the freckle and the no freckle gene, their phenotype will be freckles.

ANSWERED AT 05/12/2019 - 09:20 PM


QUESTION POSTED AT 05/12/2019 - 09:20 PM

The committee that advises the Fed on the growth of the money supply and the level of interest rates is the a. Consumer Advisory Council. c. Federal Advisory Council. b. Federal Open Market Committee. d. Council of Economic Advisers.

The committee that advised the Fed on the growth of the money supply and the level of interest rates is "B", the Federal Open Market Committee. 
The Federal Open Market Committee is the branch of the Federal Reserve Board that determines USA monetary policy. It consists of twelve members and holds eight meetings a year. The committee reviews current economic and financial conditions to plot the way forward for the Federal monetary policy. It also assesses the risks to its long-term goals of price stability and sustainable economic growth.

ANSWERED AT 05/12/2019 - 09:07 PM


QUESTION POSTED AT 05/12/2019 - 09:07 PM

Which of the following levels is the most efficient at energy conversion? a. producers b. primary consumers c. secondary consumers d. tertiary consumers

The correct answer is A) producers. That is because they create the energy themselves and don't waste that much. Primary eat those plants so they only take a part of the produced energy, while the secondary eat them and then have even less energy, and the tertiary get the least. Primary ones get the most energy compared to what they make and lose.

ANSWERED AT 05/12/2019 - 08:51 PM


QUESTION POSTED AT 05/12/2019 - 08:51 PM

Describe how physical and chemical changes may be affected by temperature

A raise in temperature usually makes it easier to break bonds or denature a substance. A colder environment will slow the molecules. This may change the state to either liquid or solid.

ANSWERED AT 05/12/2019 - 08:40 PM


QUESTION POSTED AT 05/12/2019 - 08:40 PM

Which of the following is true about acid rain? a. It is more acidic that normal rain. b. It is less acidic than normal rain. c. All rain is acid rain. d. There is no such thing as acid rain.

Ans.

Acid rain can be defined as rainfall, which becomes acidic due to atmospheric pollution. The main reason for acidic rain is industrial burning of fossil fuels ,coal, and vehicle pollution that release gases having nitrogen and sulfur oxides.

These compounds combine with atmospheric water and form acid that leads to formation of acid rain (more acidic than normal rain). The normal rain shows pH value of 5-5.6, while pH value of acid rain is around 4.

Thus, the correct answer is option (a).

ANSWERED AT 05/12/2019 - 08:31 PM


QUESTION POSTED AT 05/12/2019 - 08:31 PM

Which of the following gases is NOT found in Earth’s atmosphere? a. oxygen c. hydrogen b. nitrogen d. all of the above are in the atmosphere

D. All of the above are in the atmosphere

ANSWERED AT 05/12/2019 - 08:24 PM


QUESTION POSTED AT 05/12/2019 - 08:24 PM

Which SI unit of measurement should be used for the vertical axis? a. K b. S c. F d. J

The answer is A. K. Kelvin would be the SI unit that should be used for temperature on the vertical axis.

ANSWERED AT 05/12/2019 - 08:06 PM


QUESTION POSTED AT 05/12/2019 - 08:06 PM

Which best describes the tongue, ears, and nose?

Ears
the organ of hearing and equilibrium in vertebrates, in humans consisting of an external ear that gathers sound vibrations, a middle ear in which the vibrations resonate against the tympanic membrane, and a fluid-filled internal ear that maintains balance and that conducts the tympanic vibrations to the auditory nerve, which transmits them as impulses to the brain.
Tongue
the usually movable organ in the floor of the mouth in humans and most vertebrates, functioning in eating, in tasting, and, in humans, in speaking.
Nose
the part of the face or facial region in humans and certain animals that contains the nostrils and the organs of smell and functions as the usual passageway for air in respiration: in humans it is a prominence in the center of the face formed of bone and cartilage, serving also to modify or modulate the voice.


ANSWERED AT 05/12/2019 - 08:01 PM


QUESTION POSTED AT 05/12/2019 - 08:01 PM

If the atomic number of an element is 6 and its mass is 14 how many neutrons are contained in the nucleus? a) 6 b) 20 c) 14 d) 8

8 is going to be your answer

ANSWERED AT 05/12/2019 - 07:55 PM


QUESTION POSTED AT 05/12/2019 - 07:55 PM

What is the central element for all living things? Carbon Oxygen Hydrogen NItrogen

 Your answer would be carbon.

ANSWERED AT 05/12/2019 - 07:53 PM


QUESTION POSTED AT 05/12/2019 - 07:53 PM

Carbon dioxide would be classified as: a an element b a compound c a heterogeneous mixture d a solution

The correct answer is option B, that is, a compound.  

A substance, which is formed of two or more different elements is known as a compound. Carbon dioxide refers to a compound, comprising of three molecules that are made up of two elements, chemically combined with each other, that is, one carbon atom and two oxygen atoms. It is a chemical compound generally in the form of a gas.  


ANSWERED AT 05/12/2019 - 07:49 PM


QUESTION POSTED AT 05/12/2019 - 07:49 PM

How does negative feedback system control your breathing rate?

The negative feedback system increases blood pressure and breathing rate to give muscles that need more oxygen than you can give. Anything that tries to bring your body back into a normal range is called negative feedback.

ANSWERED AT 05/12/2019 - 07:48 PM


QUESTION POSTED AT 05/12/2019 - 07:48 PM

What is one way to describe elements? a. They are the smallest particles of any material. b. They are the building blocks of matter. c. They are the most expensive materials on earth. d. They break down easily.

1.       The answer is B. They are the building blocks of matter.
Elements are the building blocks of matters. They were also known as chemical elements that composed of atoms and protons. Elements can be seen in the periodic table of elements. Elements were usually combined to create a new chemical compound.
Element has an atomic number, isotopes, isotopes mass and atomic mass, melting point and boiling points, densities, properties, structures, occurrence and origin.
Example of elements:
=> Hydrogen = H
=> Lithium = Li.





ANSWERED AT 05/12/2019 - 07:42 PM


QUESTION POSTED AT 05/12/2019 - 07:42 PM

Reorder the elements aluminum, oxygen, fluorine, calcium, and hydrogen from the least to the greatest number of protons. Use the periodic table if needed.

Explanation:

Atomic number means the sum of total number of protons present in an element.

Atomic number of aluminium is 13. So, it has 13 protons.

Atomic number of oxygen is 8. So, it has 8 protons.

Atomic number of fluorine is 9. So, it has 9 protons.

Atomic number of calcium is 20. So, it has 20 protons.

Atomic number of hydrogen is 1. So, it has 1 proton.

Hence, the given elements are arranged from the least to the greatest number of protons as follows.

           Hydrogen < Oxygen < Fluorine < Aluminium < Calcium

ANSWERED AT 05/12/2019 - 07:26 PM


QUESTION POSTED AT 05/12/2019 - 07:26 PM

The following atoms are all variations of the element carbon: 12C, 13C, and 14C due to differing numbers of neutrons. What are these variations called? a. Molecules b. Isotopes c. Polymers d. Isomers

12C, 13C,and 14C are called isotopes because they are all the  same element 

ANSWERED AT 05/12/2019 - 06:33 PM


QUESTION POSTED AT 05/12/2019 - 06:33 PM

The recognized standard means of inquiry used by research scientists is the _____ method. a. theoretic b. scientific c. controlled d. experimental

This is the scientific method.

The scientific method includes such steps as making a background research (of already available literature), stating a hypothesis and testing this hypothesis with a help on an experiment.

ANSWERED AT 05/12/2019 - 06:29 PM


QUESTION POSTED AT 05/12/2019 - 06:29 PM

What process in animal cells requires oxygen?

The process is respiration

ANSWERED AT 05/12/2019 - 06:08 PM


QUESTION POSTED AT 05/12/2019 - 06:08 PM

The pH scale is a measurement system that indicates the concentration of ____________________ in solution.

The pH scale is a measurement system that indicates the concentration of HYDROGEN IONS in a solution.


The pH scale ranges from zero to 14. A pH that is less than 7 is considered to be acidic while a pH that is more than 7 is considered to be basic. pH 7 is considered to be neutral. The pH of a substance is dependent on the number of hydrogen ions that are present in the substance.


ANSWERED AT 05/12/2019 - 06:06 PM


QUESTION POSTED AT 05/12/2019 - 06:06 PM

All living things are either Eukarya, Bacteria, or Archaea. These three broadest categories in the classification of life are called _______. a. domains b. kingdoms c. orders d. species

These are called: domains.

Because they are three, this is also called the Three-Domain System, which was introduced by Carl Woese. The Archaea and Eukaryota are more closely related, Bacteria being more distant from the two.

ANSWERED AT 05/12/2019 - 06:05 PM


QUESTION POSTED AT 05/12/2019 - 06:05 PM

Membrane-bound organelles are not found in the cells of? a. bacteria. b. fungi. c. plants. d. protists.

a. Bacteria

Explanation: Bacteria belongs to prokaryotic domain which has no membrane bound organelles 

hope this helps :)

ANSWERED AT 05/12/2019 - 06:03 PM


QUESTION POSTED AT 05/12/2019 - 06:03 PM

Professor Tan studies water quality in streams near chemical plants. Which is a type of qualitative data that Professor Tan should record during these studies? a. the pH of the water b. any occurrences of unusual odors c. the oxygen concentration of the water d. any changes in sizes of fish population

The question says, 'Professor Tan studies water quality in streams near chemical plants. Which is a type of qualitative data that Professor Tan should record during these studies. The correct option is B. This is because qualitatitive data are data that can be observed but can not be measured. From the options given, all the other parameters mentioned can be measured with the appropriate instruments, but odourness can only be observed, it can not be measured.

ANSWERED AT 05/12/2019 - 05:58 PM


QUESTION POSTED AT 05/12/2019 - 05:58 PM