Which feature of capillaries allows efficient movement of gases and small solutes between blood and tissues?
Correct answer: B. A single endothelial cell layer
- A. A thick muscular wall
- B. A single endothelial cell layer
- C. Multiple elastic lamellae
- D. A wide lumen with valves
Explanation
Most capillaries have a wall only one endothelial cell thick, providing a short diffusion distance. They do not have the thick muscular walls, elastic layers or valves found in larger vessels. Their narrow lumen also slows blood flow for exchange.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? support@testustad.com
About Cardiovascular System
The cardiovascular system covers the chambers, valves and major vessels of the heart, the cardiac cycle, conduction pathway, blood pressure and the circulation through pulmonary and systemic circuits. It also explains artery, vein and capillary structure, exchange at capillary beds, and how the cardiac cycle differs from general blood flow.
Practise Cardiovascular System
40 free Cardiovascular System MCQs from Anatomy and Physiology for Nursing, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Anatomy and Physiology for Nursing questions like this
Anatomy and Physiology for Nursing is on 4 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Cardiovascular System questions
A patient suddenly develops sharp chest pain, severe breathlessness and a rapid pulse after several days of immobility. Which action is the priority?
At the venous end of a normal capillary, which force mainly draws fluid back into the capillary?
A patient with severe dehydration has a reduced circulating blood volume. Which renal response helps restore arterial pressure?
A nurse palpates a patient's radial pulse and notes that each beat follows ventricular contraction. Which event produces the palpable pulse wave?
The second heart sound, S2, is produced mainly by closure of which valves?
A patient has repeated blood pressure readings of 170/100 mmHg. Which response is expected from the arterial baroreceptors?