How does the role of the thymus change as an infant grows?
What will be an ideal response?
The thymus is much larger in infants and children than in adults. It produces hormones for development and maintenance of normal immunological defenses, such as "thymosin" (actually a mixture of several hormones), which promotes the development and maturation of lymphocytes. Decrease in size and secretory abilities of this gland as people age may render their immune systems less capable of preventing disease.
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A person warming up after being cold feels a warm rush as blood flows quickly to the peripheral appendages. Nitric oxide is important in this situation because it
A. raises blood temperature. B. raises blood pressure. C. relaxes the smooth muscle in the blood vessel wall. D. enhances gas exchange.
Intercalated discs and striations are both characteristic of skeletal muscle
Indicate whether the statement is true or false
The sphenoid is an example of which type of bone?
a. irregular b. short c. sesamoid d. sutural
The friction blood encounters as it flows through the vessels is called ________
A) cardiac output B) stroke volume C) peripheral resistance D) blood pressure E) diastolic pressure