The same chemical messenger may be either a hormone or a neurotransmitter, depending on its source and mode of delivery to the target tissue
Indicate whether the statement is true or false
T
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The ____________________ layer of the pleura is in direct contact with the ribs.
Fill in the blank(s) with the appropriate word(s).
When a skeletal muscle generates enough force during contraction to shorten,
A) only the sarcomere will shorten. B) the sarcomere, the A band and the I band will shorten. C) only the A band will shorten. D) only the I band will shorten. E) the sarcomere and the I band will shorten.
Clusters of cells that make up the secretory portion of an exocrine gland are known as ________.
Fill in the blank(s) with the appropriate word(s).
In which of the following are useful nutrients (amino acids, sugars, vitamins) actively retained for use in the body?
a) tubular reabsorption b) the countercurrent mechanism c) tubular secretion d) glomerular filtration