Exam 3 Study Guide

Question 1

What period is a muscle in when it is temporarily not able to respond to a stimulus?

Answer 1

Refractory period

Question 2

What is a fasciculus?

Answer 2

A bundle of skeletal muscle cells surrounded by a membrane called a perimysium.

Question 3

What type of proteins are actin and myosin?

Answer 3

Contractile proteins. Myosin makes up or composes the thick myofilaments and actin makes up the thin myofilaments.

Question 4

What characteristic distinguishes or sets apart muscle tissue?

Answer 4

Muscle tissue has the special ability to contract or shorten.

Question 5

What structure stores calcium in skeletal muscle cells?

Answer 5

Sarcoplasmic reticulum

Question 6

What would you expect to see when a sarcomere contracts and thin filaments move over thick filaments?

Answer 6

the H zone become narrower or disappear completely, the I bands become smaller, and the Z lines move closer together, while the A band remains the same length
The contact between thin and thick filaments increases

Question 7

What are the functions of muscle?

Answer 7

The main functions of skeletal muscle are to contract to produce movement, sustain body posture and position, maintain body temperature, store nutrients, and stabilize joint

Question 8

How does muscle tissue remain active and healthy?

Answer 8

Proper diet, daily use, exercise. Weight training

Question 9

What is a cross bridge?

Answer 9

A cross bridge is the globular head of a myosin molecule that attaches to an actin filament in a muscle cell

Question 10

What is the fibrous connective tissue surrounding the fascicles?

Answer 10

The connective tissue sheath covering each fasciculus is known as perimysium