Exam 8: Muscle Physiology

Indicate which characteristic applies to the specific type of muscle contraction: a.isometric b.isotonic c.eccentric d.concentric e.isometric and eccentric f.isotonic and concentric g.isotonic, eccentric, and concentric -Muscle tension exceeds the load

Following muscle damage, a limited number of satellite cells located near a skeletal muscle's surface can develop into myoblasts that fuse together to form new skeletal muscle cells.

Match muscle term with the correct characteristic. a.a storage form of glucose used in muscle cells requiring rapid energy release b.a molecule that can quickly provide materials to make ATP c.an oxygen-storing protein that makes muscle tissue appear red d.a fuel molecule for cell respiration or fermentation e.a fermentation product when our cells become anaerobic -Glycogen

Muscle tension

Which statement below is characteristic of most of the body's lever systems?

A motor unit refers to

The ____________________ system is the descending motor pathway that mediates performance of fine, discrete voluntary movements of the hands.

When a muscle atrophies, its muscle fibers

Indicate which type of muscle is associated with the property in question by writing the appropriate letter in the blank using the answer code below: a.skeletal muscle only b.single-unit smooth muscle only c.cardiac muscle only d.skeletal muscle and cardiac muscle e.skeletal muscle and single-unit smooth muscle f.single-unit smooth muscle and cardiac muscle g.skeletal, single-unit smooth, and cardiac muscles -Behaves as a functional syncytium

According to the sliding filament mechanism of muscle contraction, the muscle fibers of one motor unit slide in closer together between the muscle fibers of adjacent motor units.

Most muscle-lever systems work at a mechanical disadvantage.

The skeletal muscle shortens during concentric, isotonic contraction.

Calcium ions must bind specifically to part ____ in order for the muscle fiber to contract.

Fast-oxidative (type IIa) fibers

The contractile response of a muscle fiber to a single action potential is called a(n) ____________________.

Sarcopenia is a type of muscular atrophy that involves the body's immune system attacking certain skeletal muscles.

Indicate which type of muscle is associated with the property in question by writing the appropriate letter in the blank using the answer code below: a.skeletal muscle only b.single-unit smooth muscle only c.cardiac muscle only d.skeletal muscle and cardiac muscle e.skeletal muscle and single-unit smooth muscle f.single-unit smooth muscle and cardiac muscle g.skeletal, single-unit smooth, and cardiac muscles -Is innervated by motor neurons

All skeletal muscles are attached to the skeleton.

What is responsible for initiating contraction of smooth muscle?

Repaying the oxygen deficit involves the formation of lactate in fatigued muscles.