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: Producing coagulation factors - This function is associated more with the liver, which produces various clotting factors involved in the coagulation process.
b. Destroying dying red blood cells: The spleen is primarily involved in the destruction of old or damaged red blood cells. It acts as a reservoir for blood, where it filters out old or abnormal red blood cells, recycling their components and removing any potentially harmful substances.
c: Producing leukocytes before birth - Leukocytes (white blood cells) are primarily produced in the bone marrow, not the spleen.
d: Storing glycogen - Glycogen storage is mainly associated with the liver and muscles, not the spleen.
Correct Answer is A
Explanation
a. The volume of the cell decreases: When a red blood cell is placed in a hypertonic solution (solution with a higher concentration of solutes outside the cell compared to inside), water will move out of the cell through osmosis to equalize the concentration on both sides of the cell membrane. This movement of water causes the red blood cell to shrink (crenate).
b. The permeability of the cell membrane decreases: Incorrect. The permeability of the cell membrane to water remains relatively constant.
c. The permeability of the cell membrane increases: Incorrect. Osmosis is a passive process that doesn't require increased permeability.
d. The volume of the cell increases: Incorrect. A hypertonic solution will cause the cell to lose water and shrink.
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