Muscle Types and Contraction Quiz

Which type of muscle is voluntary and striated?

Which type of muscle is found in only one place in the body and is involuntary?

Which type of muscle is visceral and involuntary?

Which type of muscle is responsible for the contraction of the heart?

Which type of muscle is responsible for movement in the body?

Which type of muscle is found in the walls of organs and blood vessels?

Select the correct statement regarding nerve supply to muscles

Which type of muscle is responsible for involuntary movements?

Muscle activity generates heat, T OR F

What is made up of individual smooth muscle cells or small groups of cells and is used for small delicate movements

Which term refers to muscle cells?

What is the contracting unit of skeletal muscle called?

What is the site where motor nerve fibers connect with muscle fibers called?

What determines the size of the resulting movement in a muscle unit?

What is the role of a fixator in muscle actions?

What is the term for a single muscle fiber contraction?

What is the role of an antagonist muscle in muscle actions?

What is the term for the time between the nerve stimulus and the beginning of contraction?

What is the role of a synergist muscle in muscle actions?

Panting or sweating is NOT a mechanism to eliminate excess heat, T OR F

Which type of muscle is striated and contracts without external stimulation?

Which type of muscle is responsible for fine movements and requires specific impulses from the autonomic nerves to contract?

Shivering is a type of spasmodic muscle contraction that increases heat production T OR F

Which type of muscle has long, branched fibers that form networks of cells with firm end-to-end attachments between them?

Which type of muscle has actin and myosin filaments that slide over each other, causing shortening of the sarcomeres?

Which type of muscle is involuntary and has only one central nucleus per cell?

Which type of muscle has sliding of filaments over each other that causes shortening of the sarcomeres?

Which type of muscle contracts in a rapid, wavelike fashion and allows blood to be effectively squeezed out of the chambers?

Which type of muscle contracts without external stimulation and adopts the contraction rate of the most rapid cell in the group?

Which type of muscle has small, spindle-shaped cells with a single central nucleus?

Skeletal muscle is under _________ and must receive nerve impulses to contract and produce the desired action

[initiation of muscle conraction] Acetylcholine binds to receptors on the ___________->impulse travels through the ______ to the interior of the cell->to the ___________

[Initiation of muscle contraction] Acetylcholine binds to receptors on sarcolemmal surface->impulse travels through the transverse tubules to the interior of the cell->to the sarcoplasmic reticulum which causes release of stored ________ into the sarcoplasm and diffuse into __________ to shorten (contraction) - powered by ATP

[Muscle relaxation] _________ pumps calcium ions back in, pulling it out of the ______ and muscle fibers return to their original length

Energy is needed to pump calcium back into the SR

Individual muscle fibers contract completely when stimulated by their nerves, this is called ___________

Nerve impulses are timed so that twitches of individual muscle fibers can occur at __________, resulting in smooth, sustained muscle contractions

Entire muscle contractions last ______-

Smooth muscle is

Visceral smooth muscle

Multiunit muscle

what type of smooth muscle makes up the iris and ciliary body, blood vessels and bronchioles

In walls of many soft internal organs

Contracts without external stimulation

No fine movements possible, contracts in large, rhythmic waves

It reacts to stretching by contracting more strongly (except in the uterus)

[chemistry of contraction] When need for oxygen exceeds supply, muscle fibers shift to ____ to produce energy->______ builds up as a byproduct of incomplete glucose breakdown

During muscle contraction, what builds up as a byproduct of incomplete glucose breakdown

The number of muscle fibers per nerve determines the size of the resulting movement

The number of muscle fibers per nerve does not determine the size of the resulting movement

Delicate muscles have fewer muscle fibers per motor unit than large muscles, making larger movements

Delicate muscles have fewer muscle fibers per motor unit than large muscles, making smaller movements

Delicate muscles have more muscle fibers per motor unit than large muscles, making larger movements

A motor unit is

When relaxed, the actin and myosin filaments in a muscle fiber overlap a little

When relaxed, the actin and myosin filaments in a muscle fiber do not overlap at all

When stimulated to contract by a nerve impulse, cross bridges on the myosin filaments move back and forth pulling the actin filaments on both sides toward the center myosin filament

When stimulated to contract by a nerve impulse, cross bridges on the myosin filaments move back and forth pulling the actin filaments on both sides away from the center myosin filament

When stimulated to contract by a nerve impulse, cross bridges on the myosin filaments move side to side pulling the actin filaments on both sides toward the center myosin filament

[during contraction] Sliding filaments over each other causes shortening of the sarcomeres

[during contraction] Sliding filaments over each other causes lengthening of the sarcomeres

Combines shortening of the end to end sarcomeres in a muscle fiber = contraction

Combines shortening of the end to end sarcomeres in a muscle fiber = stricture