Which blood vessel type would you expect to have the thickest smooth muscle layer? Why?
What will be an ideal response?
Artery; because it needs to move blood and withstand the pressure from the heart pumping the blood
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Unlike inspiration, expiration is a passive act because no muscular contractions are involved. Expiration, however, depends on two factors. Which of the choices below lists those two factors?
A) the recoil of elastic fibers that were stretched during inspiration and the inward pull of surface tension due to the film of alveolar fluid B) the expansion of respiratory muscles that were contracted during inspiration and the lack of surface tension on the alveolar wall C) the negative feedback of expansion fibers used during inspiration and the outward pull of surface tension due to surfactant D) combined amount of CO2 in the blood and air in the alveoli
The designation Ca2+ means
A) calcium has gained two more electrons. B) calcium has gained two more protons. C) calcium has space for two more protons. D) calcium has space for two more electrons.
A directional term that means the same as posterior is:
A) anterior. B) sagittal. C) ventral. D) dorsal.
In an ascending pathway, axons of the secondary neuron travel from the
A. receptor to the spinal cord. B. receptor to the brain. C. spinal cord through the brainstem to the thalamus. D. thalamus to the cerebral cortex. E. spinal cord to cerebellum.