How does colloid osmotic pressure contribute to the regulation of blood pressure?
It helps maintain fluid balance between the blood vessels and tissues.
It triggers the activation of baroreceptors.
It drives oxygen diffusion across capillary walls.
It increases blood vessel diameter to lower blood pressure.
The Correct Answer is A
A. It helps maintain fluid balance between the blood vessels and tissues:
Colloid osmotic pressure, primarily generated by plasma proteins like albumin, draws fluid from the interstitial space into the capillaries, preventing excessive edema. This maintains blood volume and effective circulating pressure, which indirectly supports blood pressure regulation.
B. It triggers the activation of baroreceptors:
Baroreceptors respond to stretch in vessel walls, not osmotic pressure.
C. It drives oxygen diffusion across capillary walls:
Oxygen diffusion occurs due to partial pressure gradients, not osmotic pressure.
D. It increases blood vessel diameter to lower blood pressure:
Colloid osmotic pressure does not influence vessel tone; vessel diameter is regulated by smooth muscle tone and autonomic signals.
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Related Questions
Correct Answer is B
Explanation
A. To transport oxygen-rich blood to the systemic circulation:
The aorta and systemic arteries carry blood to the body; coronary arteries are specific to the myocardium.
B. To supply the heart muscle with oxygen and nutrients:
Coronary arteries deliver oxygenated blood and essential nutrients to the myocardium, supporting continuous contraction. Blockage leads to ischemia, angina, or myocardial infarction.
C. To regulate blood pressure in the pulmonary circulation:
Pulmonary circulation is regulated by the pulmonary artery, veins, and right heart function, not the coronary arteries.
D. To remove carbon dioxide from the systemic circulation:
Carbon dioxide removal occurs via the lungs, not the coronary arteries.
Correct Answer is B
Explanation
A. Atrioventricular (AV) node:
The AV node can act as a secondary pacemaker if the SA node fails, but its intrinsic rate (40-60 bpm) is slower than the SA node. Its primary role is delaying conduction to allow ventricular filling, not initiating the heartbeat.
B. Sinoatrial (SA) node:
The SA node, located in the right atrium near the superior vena cava, is the primary pacemaker of the heart. It initiates electrical impulses at a rate of 60-100 bpm, setting the rhythm for the entire heart. Dysfunction can lead to bradycardia or arrhythmias.
C. Purkinje fibers:
Purkinje fibers conduct impulses rapidly throughout the ventricles but do not serve as the primary pacemaker. They can act as a backup pacemaker at 20-40 bpm if higher centers fail.
D. Bundle of His:
The Bundle of His transmits impulses from the AV node to the ventricles. While it is part of the conduction system, it cannot independently set the heart rate under normal conditions.
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