Ex. 11 Muscle Physiology Graded A+
A skeletal muscle is stimulated to contract by what structure? ️️Nerve
What chemical crosses the synapse, causing a muscle to contract? ️️Acetylcholine (Ach)
Where is calcium released to cause muscle contraction? ️️Sarcoplasmic reticulum
What a...
A skeletal muscle is stimulated to contract by what structure? ✔️✔️Nerve
What chemical crosses the synapse, causing a muscle to contract? ✔️✔️Acetylcholine (Ach)
Where is calcium released to cause muscle contraction? ✔️✔️Sarcoplasmic reticulum
What are the two types of myofilaments? ✔️✔️Actin and myosin
Does a single muscle fiber or an entire muscle contract by a all-or-none response? ✔️✔️Single muscle
fiber
Name the first phase after a stimulus in a muscle contraction ✔️✔️Lag phase
Define Subthreshold stimulus ✔️✔️Type of stimulus that will not elicit a response in the muscle
What happens to the strength of contraction during wave summation? ✔️✔️The strength of
contraction increases greatly
Describe Tetanus ✔️✔️continuous smooth muscle contraction brought about by rapid, sequential
stimuli
What is maximus recruitment? ✔️✔️Stimulus needed to trigger all muscle fibers in a muscle to
contract.
How do tetanus and twitch, as demostrated in the lab, correlate to human muscle contraction? Which
one is more reflective of human muscle response? why? ✔️✔️Human muscles do not normally
respond by singular contractions seen as twitches. Human muscle contraction occurs by numerous
firings demonstrated as tetanic contractions.
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