Chapter 8 Muscular System

The molecule _____________________ supplies energy for muscle contraction

ATP

____________________ is a term describing movement of a body part away from the midline of the body

Abduction

_________________ is another name for muscle cells.

Muscle fibers

________________ is the protein that makes up the thick myofilaments

Myosin

_________________ is the protein that makes up the thin myofilaments.

actin

Smooth muscles can also be called: a. visceral muscles b. involuntary muscles c. nonstriated muscles d. all of the above

all of the above

Cardiac muscle makes up the bulk of the tissue of the ________________

heart

The muscle attachment to the more movable bone is called the ________________________

insertion

____________________ is a type of muscle contraction that does not produce movement and does not allow the muscle to shorten but does increase muscle tension.

isometric

________________ is a type of muscle contraction that produces movement in a joint and allows the muscle to shorten.

isotonic

________________________ is the waste product produced when the muscle must switch to an energy supplying process that does not require oxygen

lactic acid

The muscle attachment to the more stationary bone is called the _______________________

origin

Skeletal muscles can also be called: a. visceral muscles b. voluntary muscles c. cardiac muscles d. all of the above

voluntary muscles

________________________ is term used to describe the movement that is the opposite of flexion

Extension

A single motor neuron which all the muscle fibers in innervates is called a __________________________

motor unit

The three functions of the muscular systems are ____________________, ___________________________, and ___________________________

movement, posture, heat production

The ____________________ is the basic functional unit of contraction in a skeletal muscle.

sarcomere

______________________ describes the hand position when the body is in anatomical position

supination

____________________________ is the minimal level of stimulation required to cause a muscle fiber to contract.

threshold stimulus