Muscular System: Skeletal Muscle Activity

Question 1

4 special functional properties of muscle fibers

Answer 1

irritability
contractility
extensibility
elasticity

Question 2

ability to recoil and resume their resting length after being stretched

Answer 2

Elasticity

Question 3

the ability to receive and respond to a stimulus

Answer 3

irritability

Question 4

ability of muscle fibers to stretch

Answer 4

extensibility

Question 5

the ability to forcibly shorten when adequately stimulated

Answer 5

Contractility

Question 6

A signal sent by a motor neuron (nerve cell) to stimulate a muscle fiber.

Answer 6

Nerve stimulus

Question 7

it carries an
electrical signal from the brain or spinal cord
to the muscle.

Answer 7

Motor neuron

Question 8

it carries an
electrical signal from the brain or spinal cord
to the muscle.

Answer 8

Motor neuron

Question 9

The point
where the motor neuron meets the muscle
fiber. This is where the nerve’s signal is
transmitted to the muscle.

Answer 9

Neuromuscular Junction (NMJ)

Question 10

When the nerve
signal reaches the end of the neuron, it triggers
the release of a chemical messenger,
acetylcholine (ACh), into the synaptic cleft (the
space between the neuron and the muscle
fiber)

Answer 10

Release of Neurotransmitter

Question 11

electrical impulse

Answer 11

Action Potential

Question 12

The formation of cross bridges requires ______ and ____

Answer 12

Calcium Ions and ATP

Question 13

A single nerve impulse stimulates the muscle, leading to a quick
contraction and complete relaxation. This is the basic response of a
muscle fiber when it is stimulated once.

Answer 13

Single Twitch