The heart valves are innervated by the autonomic nervous system
Indicate whether the statement is true or false
F
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List the six major functions of proteins
What will be an ideal response?
Mature cartilage is avascular
Indicate whether this statement is true or false.
________________________________________, tiny passages in birds' lungs, are the primary sites of gas exchange between the air and blood
Fill in the blank(s) with correct word
What is the purpose of motor nerve varicosities as they relate to smooth muscle?
A) They link the thin filaments to the inside of the sarcolemma in smooth muscle. B) They prevent single-unit smooth muscle cells from pulling apart. C) They enable each cardiac myocyte to directly stimulate its neighbors. D) They reabsorb the decomposition products of acetylcholine after acetylcholinesterase breaks it down. E) They release neurotransmitter onto smooth muscle cells.