Musclar function

Question 1

How many muscles are there in the human body?

Answer 1

Over 600 muscles

Question 2

What percentage of body weight do muscles make up?

Answer 2

40-50%

Question 3

List the general characteristics common to muscle tissue.

Answer 3

• Contractility
• Extensibility
• Elasticity
• Atrophy
• Hypertrophy

Question 4

What is contractility in muscle tissue?

Answer 4

The ability of a muscle to contract and generate force when stimulated by a nerve

Question 5

What does extensibility mean in the context of muscle tissue?

Answer 5

The ability of a muscle to stretch beyond its normal resting length

Question 6

Define elasticity in muscle tissue.

Answer 6

The muscle’s ability to return to its original resting length after the stretch is removed

Question 7

What is atrophy?

Answer 7

The thinning or wasting away of muscle

Question 8

What can cause muscle atrophy?

Answer 8

• Age
• Malnutrition
• Genetics
• Lack of physical activity
• Some medical conditions

Question 9

What is hypertrophy?

Answer 9

An increase in muscle mass

Question 10

What typically causes hypertrophy?

Answer 10

Strength training, such as weightlifting

Question 11

What type of neurons bring impulses from the CNS to the muscles?

Answer 11

Motor neurons

Question 12

What do capillaries provide to muscles?

Answer 12

• Oxygen
• Nutrients
• Calcium
• Remove waste products

Question 13

How many types of muscle are there?

Answer 13

3 types

Question 14

List the three types of muscle.

Answer 14

• Skeletal
• Cardiac
• Smooth

Question 15

What type of control do skeletal muscles have?

Answer 15

Voluntary control

Question 16

What is the appearance of skeletal muscle under a microscope?

Answer 16

Striated appearance

Question 17

Where are smooth muscles found?

Answer 17

Lines the walls of blood vessels and hollow organs

Question 18

How do cardiac muscles function?

Answer 18

Involuntary movements - contracts without conscious thought

Question 19

What is the origin of a muscle?

Answer 19

Generally proximal to the insertion

Question 20

What is the insertion of a muscle?

Answer 20

Generally distal to the origin

Question 21

Why do muscles need both an origin and insertion?

Answer 21

Allows force to be exerted, which allows movement of the skeleton

Question 22

Name an anterior muscle.

Answer 22

Examples include deltoid, pectoralis, iliopsoas

Question 23

Name a posterior muscle.

Answer 23

Examples include trapezius, triceps brachii, latissimus dorsi

Question 24

Fill in the blank: The ______ is the muscle of the heart.

Answer 24

Cardiac muscle

Question 25

True or False: Cardiac muscle is striated like skeletal muscle.

Answer 25

True