Exam 7: Muscle Physiology

Match the skeletal muscle proteins, labelled a. through f., with the descriptions. (Options may be used more than once or not at all.) -form(s) a helical chain

Which of these statements applies to T tubules

Denervated muscle fibres become progressively smaller and their content of actin and myosin decreases.

Increasing the number of recruited motor units in a muscle increases its force or strength of contraction.

Skeletal muscles are stimulated to contract by release of the neurotransmitter ____________________.

Match the types of muscles, labelled a. and b., with the characteristics. -muscle tension exceeds the load

Why must the oxygen debt be "paid off" following rigorous muscular activity

Cross bridges have actin binding sites that are normally covered by troponin and tropomyosin, except during excitation-contraction coupling.

Which of these structures controls the conscious initiation of muscle contraction

The H zone of the sarcomere consists of myosin but does not contain actin.

Acetylcholinesterase removes ACh from receptors.

During muscle contraction, the A band becomes shorter.

Binding of which substance to myosin permits cross bridge of which action between actin and myosin

Which of these characteristics does NOT apply to smooth muscle

Which of these actions happens during contraction of skeletal muscle fibres

Match the skeletal muscle proteins, labelled a. through f., with the descriptions. (Options may be used more than once or not at all.) -found in the I band

Which of these statements describes the H zone

In smooth muscle, Ca²⁺ binds with the protein ____________________, which is structurally similar to troponin.

Which of these conditions occurs as the result of a lack of acetylcholinesterase in the synaptic cleft

Which of these statements applies to single-unit smooth muscle