Which of the following statements explains the difference in thickness between the right and left ventricle myocardium?
The right ventricle chamber has a smaller overall capacity than the left ventricle
The right ventricle receives blood from right atrium, which has lower pressure than left atrium.
The right ventricle pumps a smaller blood volume than the left ventricle.
The right ventricle pumps blood into pulmonary circulation, which has lower resistance than systemic circulation
The Correct Answer is C
a. The right ventricle chamber has a smaller overall capacity than the left ventricle: While true, this doesn't directly explain the difference in muscle thickness.
b. The right ventricle receives blood from right atrium, which has lower pressure than left atrium: Both ventricles receive blood from low-pressure atria. The pressure difference is between the circulation systems they pump blood into.
c. The right ventricle pumps a smaller blood volume than the left ventricle. The right ventricle pumps blood to the lungs, a low-pressure system. Therefore, the right ventricle wall (myocardium) is thinner than the left ventricle wall. The left ventricle pumps blood against the higher resistance of the systemic circulation, so its wall is much thicker and stronger.
d. The right ventricle pumps blood into pulmonary circulation, which has lower resistance than systemic circulation: This is the core reason for the difference in muscle thickness.
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Related Questions
Correct Answer is B
Explanation
a. The plasma membrane is composed of a bilayer of protein molecules: This is incorrect. The plasma membrane is primarily composed of a bilayer of phospholipids, with proteins interspersed within this bilayer.
b. The plasma membrane is selectively permeable: This is correct. The plasma membrane regulates the entry and exit of substances, allowing certain molecules to pass while restricting others.
c. The plasma membrane does not participate in cellular activities: This is incorrect. The plasma membrane is actively involved in various cellular activities, including signaling, transport, and maintaining homeostasis.
d. The plasma membrane receptors are specialized lipids: This is incorrect. Receptors on the plasma membrane are typically proteins, not lipids, which are involved in signal transduction and cellular communication.
Correct Answer is A
Explanation
a. 1 to 2 liters: Correct. The average adult typically produces about 1 to 2 liters of urine per day.
b. 3 to 5 liters: This is an unusually high amount of urine production and is not typical for most adults.
c. 5 to 7 liters: This is an excessively high amount of urine production and would usually indicate a medical condition.
d. 2 to 4 liters: This range is slightly higher than average but can still be considered normal under certain conditions such as increased fluid intake or diuretic use.
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