Mr. Martin is suffering from a condition known as ventricular tachycardia, in which his heart beats too quickly. Would an alpha-blocker or a beta-blocker help alleviate his problem? Why?
What will be an ideal response?
You would want to use a beta-blocker, because the stimulation of beta-1 receptors increases heart rate. By blocking these receptors, parasympathetic influence will predominate and the heart will slow down.
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Compared with skeletal muscle, which of the following is not true of smooth muscle?
A. There is one nucleus per cell. B. There are no striations. C. There are no Z discs. D. It has an ability to regenerate through mitosis. E. There are more T tubules.
As the bone matrix calcifies and the secreting cells become walled in,
A. osteoblasts become osteocytes. B. osteogenic progenitors become osteoclasts. C. osteoblasts become osteoclasts. D. osteoclasts become osteocytes.
The central sulcus separates which lobes?
A) frontal from parietal B) parietal from occipital C) temporal from parietal D) frontal from temporal
The portion of a hair that protrudes above the surface of the skin is the ________.
A. hair shaft B. hair bulb C. hair follicle D. hair root E. dermal papilla