Exam 6: The Muscular System

What delivers a signal from the motor neuron to all the sarcomeres of a muscle cell?

Match each definition in the first column to the correct term in the second column. -Covers the myosin binding sites on actin.

Match each definition in the first column to the correct term in the second column. -Caused by a neuron,stimulating muscle cells to contract.

My sister Adel plays tennis with me every Wednesday evening.Towards the end of our game our quick hits are mostly powered by ________.

During muscle contraction the heads of myosin filaments pull actin filaments toward the center of a ________.

The release of acetylcholine into the neuromuscular junction is shortly followed by the release of ________ ions from the sarcoplasmic reticulum.

Which of these structures is part of a muscle cell's plasma membrane that delivers signals to the sarcomere?

A condition that occurs when a myosin head binds to an actin molecule in order to contract a muscle is called ________.

Rigor mortis sets in after the death of humans and other animals because the supply of ATP decreases to the point in which calcium can no longer be removed from the cell.At this point,the myosin molecules attach to the thin filament.The muscles stiffen and limbs cannot be moved.Why and for how long does the muscle then remain in this continuously contracted state?

________ provides the energy required for voluntary muscle contraction in an individual's body.

Match each definition in the first column to the correct term in the second column. -Protein that makes up the thin myofilament.

Which of these cell types can be described as muscle cells that contract rapidly,are rich in glycogen deposits,and depend on anaerobic respiration to produce ATP?

How do calcium ions affect muscle contractions?

The ________ is a modified form of endoplasmic reticulum that stores and releases calcium ions when a muscle contracts.

A person may have a muscle injury that really affects the tendon and not the muscle tissue itself.Why is it that after a hard workout,muscle pain will go away in a few days at most,but tendinitis lasts so much longer?

Which component of a muscle does the Ca++ combine with to allow a contraction to occur?

Match each definition in the first column to the correct term in the second column. -Muscle fibers designed for endurance,contract slowly,and have a steady supply of energy.

When a muscle is stimulated prior to full relaxation of a previous contraction and the second stimuli is added to the first contraction,it is referred to as ________.

Describe the four traits that all muscle types share.

Match each definition in the first column to the correct term in the second column. -Calcium binds to this protein to initiate a contraction.