Why do veins have relatively thin walls?
A) It allows a typical vein to change the diameter of its lumen.
B) It allows a typical vein to be stretched as its diameter increases during ventricular systole.
C) A typical vein's wall allows exchange to occur quickly by diffusion across endothelial cells or through gaps between adjacent endothelial cells.
D) A typical vein does not need to withstand much pressure.
E) There are sphincters associated with the walls of veins, which allow vasomotion to occur.
D) A typical vein does not need to withstand much pressure.
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Which accurately describes sensory and motor pathways?
A. Sensory pathways terminate in the brain, and motor pathways terminate at effectors. B. Sensory pathways terminate at effectors and motor pathways terminate in the brain. C. Both sensory and motor pathways terminate in the brain. D. Both sensory and motor pathways terminate in the PNS.
Respiratory distress syndrome is caused by lack of __________.
a. mucus b. a surfactant c. an alveolar surface area d. ciliated epithelial cells
Over 60% of all brain cells are neurons
a. True b. False Indicate whether the statement is true or false
When a cell is dividing, the genetic material is in the compact form of ________.
What will be an ideal response?