Exam 9: Muscles and Muscle Tissue

Myasthenia gravis is a disease that is believed to be caused by autoimmune disorder, resulting in the loss of ACh receptors at the motor end plate of muscle fibers. Which of the following is likely to be a symptom of myasthenia gravis?

Smooth muscles relax when intracellular Ca2+ levels drop but may not cease contractions.

A patient has no peristalsis in the gastrointestinal tract. Explain a possible complication of this condition.

An increase in the calcium ion level in the sarcoplasm starts the sliding of the thin filaments. When the level of calcium ions declines, sliding stops.

Immediately following the arrival of the stimulus at a skeletal muscle cell there is a short period called the _________period during which the neurotransmitter is released by exocytosis, diffuses across the synaptic cleft, And binds to its receptors.

What is the functional role of the T tubules?

What part of the sarcolemma contains acetylcholine receptors?

A motor neuron and all the muscle cells that it stimulates are referred to as a motor end plate.

When a muscle is unable to respond to stimuli temporarily, it is in which of the following periods?

Muscle cells store more creatine phosphate than ATP resulting in the muscle having a reserve source of energy.

One of the functions of skeletal muscle contraction is production of heat.

An anaerobic metabolic pathway that results in the production of two net ATPs per glucose plus two pyruvic acid molecules is __________ .

The oxygen-binding protein found in muscle cells is __________ .

Creatine phosphate functions in the muscle cell by_________ .

Describe how the unique contractile mechanism of smooth muscle allows it to contract and remain in a contracted state for long periods of time with relatively little energy expenditure.

The force of muscle contraction is controlled by multiple motor unit summation or recruitment.

A smooth, sustained contraction from rapid stimulation of skeletal muscle fibers is called__________ .

Although all the anatomical parts of muscle work together to give it it's characteristics, which of the following proteins listed below would be most associated with the characteristics of excitability?

Cardiac muscle has a limited regenerative capacity.

Addition of more myoglobin to a muscle fiber would have the largest effect on __________.