Which of the following statements about cardiac anatomy is CORRECT: A. Papillary muscles contract to open...

Which of the following statements about cardiac anatomy is CORRECT:

A. Papillary muscles contract to open the AV valves.

B. Cardiac cells in the SA node are functionally coupled by chemical synapses.

C. The heart does not have its own arteries, capillaries, and veins because it obtains vital substances from the blood that is being pumped through it.

D. The volume of the left ventricle is equal to the volume of the right ventricle.

*Option D is the correct answer, please explain why choice D is correct, and why choice A is incorrect! Thank you!

Solutions

Expert Solution

The volumes of left and right ventricles are always equal, despite differences in size, shape and function. Right ventricle pumps blood to lungs while let ventricle supplies blood to rest of body. Blood circulation is a closed loop. These equal volumes pumped by both ventricles are required to be equal to maintain equilibrium of the cardiac output. If the volumes are not equalized, excess blood from right ventricle will have to be pooled in the lungs. This will lead to issues such as shortness of breath, fatigue and heart issues.

Papillary muscles are muscles that project into lumen of the ventricles of heart and are attached to AV cusps. These muscles will contract in response to myocardial contraction. Contraction of papillary muscle will cause the AV valves to close during systole. This prevents the prolapse of the AV valves and prevents the backflow of blood into atria. Thus, they do not open the AV valves.

Sinoatrial node has the pacemaker cells that generate spontaneous action potential. They send signals to the AV node. They are electrically couples oscillators and are not coupled to chemical synapses, where neurotransmitters are involved.

The Aorta branches to form the coronary arteries that supplies blood to heart via smaller arteries. These coronary arteries provide nutrition to the heart. Superior and inferior vena capa carry blood to the heart.

Right choice: D. The volume of the left ventricle is equal to the volume of the right ventricle.

Sydney Mullin answered 1 year ago

Next > < Previous

Related Solutions

Which of the following statements are correct? A. A complete contract can be written with the...

Which of the following statements are correct? A. A complete contract can be written with the inclusion of piece rate pay. B. Firms pay workers more than their reservation options so that workers do not want to leave. C. Workers would exert effort into work if their employment rent is negative. D. Employment rent benefits workers but harms the firms as it implies higher production costs. Select one: a. A, B, D b. B, C c. A, D d. A,...

Which of the following statements about the cost of capital is CORRECT ?

Which of the following statements about the cost of capital is CORRECT ?Select one:a. Both the cost of debt and equity financing will decrease when a firm expands into a risky new area.b. Both the cost of debt and equity financing will decrease when a nuclear plant company encounters a ban on nuclear power generation in certain states.c. The WACC of a firm will decrease when investors become more risk averse.d. Both the cost of debt and equity financing will...

Which of the following statements about valence electrons is correct?

Which of the following statements about valence electrons is correct? Li has 1 valence electron and S has 6 valence electrons Mg has 12 valence electrons and O has8 valence electrons K has 19 valence electrons and Cl has 17 valence electrons Al has 13 valence electrons and C has 12 valence electrons Li has 3 valence electrons and Na has 11 valence electrons

Which of the following statements is CORRECT about a yield curve?

Which of the following statements is CORRECT about a yield curve? a. A yield curve reflects the relationship between bond yields and the inflation rate. b. A humped yield curve reflects interest rates lower than short term maturities. c. A normal yield curve is generally humped. d. An upward sloping yield curve is referred to as abnormal or inverted. e. A downward sloping yield curve is referred to as abnormal or inverted

6. According to the open economy macroeconomic model, which of the following statements is (are) correct?...

6. According to the open economy macroeconomic model, which of the following statements is (are) correct? (x) The usual effects of capital flight include a rightward shift of demand in the loanable funds market and a rightward shift of the NCO curve, (y) Capital flight typically causes a decrease in the domestic interest rate and an increase in NCO. (z) Capital flight typically causes the real exchange rate of the domestic currency to depreciate because capital flight causes an increase...

4. According to the open economy macroeconomic model, which of the following statements is (are) correct?...

4. According to the open economy macroeconomic model, which of the following statements is (are) correct? (x) Capital flight requires the cooperation of the country’s airlines to move precious metals to safe areas. (y) A large and sudden movement of funds out of a country is called capital flight (z) Capital flight is frequently caused by an increase in political or economic instability. A. (x), (y) and (z) B. (x) and (y) only C. (x) and (z) only D. (y)...

1. Which of the following statements is (are) correct? (x) In the open-economy model, the key...

1. Which of the following statements is (are) correct? (x) In the open-economy model, the key determinant of net capital outflow is the real interest rate. (y) When the U.S. real interest rate decreases and is low, owning U.S. assets is less attractive and so U.S. net capital outflow is relatively high. (z) Ceteris paribus, if the German real interest rate were to increase, German net capital outflow would fall and net capital outflow of other countries would rise. A....

1. Which of the following statements is (are) correct? (x) In the open-economy model, the key...

Which of the following statements is not correct about cholesterol? a. it is an essential component...

Which of the following statements is not correct about cholesterol? a. it is an essential component of cell membranes b. it is the precursor of steroid hormones c. it is soluble in non-polar solvents d. it is soluble in polar solvents Which intermolecular force exists between all molecules regardless of polarity? Which of the following compounds exhibits primarily dipole-dipole intermolecular forces? a. CH3-O-CH3 b. CH3CH3 c. CO2 d. F2

Which one of the following statements is correct about hypothesis testing?

Subjects