Which functional feature best describes the manner in which cardiac muscle contracts?
Automaticity (autorhythmicity) promotes the spontaneous contraction of the cardiac muscle cells.
Refractory periods in cardiac contractions are relatively short.
Only some motor units contract in cardiac muscle.
Nerve fibers must stimulate cardiac muscle cells for them to contract.
Automaticity (autorhythmicity) promotes the spontaneous contraction of the cardiac muscle cells.
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Platelets function in
A) forming temporary patches in injured areas. B) initiating the clotting process. C) transporting chemicals important for clotting. D) contraction after clot formation. E) All of the answers are correct.
A group of ducks or chickens is a/an ________
Fill in the blank(s) with correct word
Cardiac muscle cells differ from skeletal muscle fibers in that the cardiocytes are uniquely interconnected by (the) ________.
A) sarcoplasmic reticulum B) Z discs C) gap junctions D) intercalated discs E) T tubules
The main immediate source of ATP (lasting about 10 seconds) as muscle contractions begin comes from:
A) glycogen. B) glucose. C) fat. D) creatine phosphate.