Explain how skin helps to thermally regulate body temperature
When body temperature rises, the blood vessels beneath your epidermis are dilated and filled with blood, your skin reddens, and the surface of your skin is warm and wet due the excess heat in the blood. As the moisture evaporates, the excess heat evaporates with it, and your skin cools. If your body temperature then falls below normal, sensible perspiration stops, blood flow to the skin is reduced, and the skin surfaces cools and dries, releasing little heat into the environment.
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As the aorta extends posteriorly beyond the diaphragm, it is called the ________
A) aortic arch B) thoracic aorta C) abdominal aorta
Dorsal rami of spinal nerves innervate
A) anterior neck muscles. B) deep back muscles. C) intercostal muscles. D) muscles of the upper limb. E) plexuses.
All of the following are true of the plasma membrane, except
A. it is selectively permeable to various substances, controlling which substances can cross the membrane. B. the glycocalyx provides structural integrity to the plasma membrane. C. charged or large molecules can sometimes enter a cell via membrane proteins. D. it is mainly composed of a phospholipid bilayer. E. transmembrane proteins may function as ion channels, enzymes, or receptors.
True or False? Vaccinations provide natural-type immunity. Select one:
a. true b. false