The Muscular System
Chapter 15-3
Page 488


Muscles are tissues that can shorten along their length

Muscles only move things when they contract or shorten

There are more than 600 muscles in the muscular system

Muscular System

The Muscular System works with the Skeletal System to provide movement.

The Muscular System works within internal organs to support bodily functions

2 Muscle Categories
Voluntary Muscles
Skeletal
Involuntary Muscles
Smooth
Cardiac

Voluntary Muscles
 Muscles that are under conscious control
Examples:

Muscles that move joints (biceps and triceps)

Muscles that move skin (smiling, raising your eyebrows)

Voluntary Muscles

-

Involuntary Muscles
 Muscles NOT under conscious control

Examples: heart, digestive organs, diaphragm (breathing)

Involuntary Muscles

Involuntary Muscles

3 Types of Muscle Tissue
1. Skeletal Muscle
2. Smooth Muscle
3. Cardiac Muscle

3 Types of Muscle Tissue

Skeletal Muscle
 P 489
 Muscle attached to the skeleton, making movement possible

Skeletal Muscle
-

Smooth Muscle
-
 P 489
 Involuntary muscle found inside many internal organs of the body

Smooth Muscle
-

Cardiac Muscle
-
 p489
 Muscle tissue found only in the heart

3 Types of Muscle Tissue

Striated Muscle
(cardiac)

Striated Muscle
(skeletal)

Smooth Muscle
-

Voluntary
Striated
Involuntary
Involuntary
Non-Striated Striated
Quickly Slowly
Yes
No
Attached to skeleton
Internal
Organs &
Blood Vessels
Quickly
No
Heart

 P 490
Tendon
-
 Strong connective tissue that attaches a muscle to bone.

Tendon

Tendon Video

Quiz

Flexor -


Flexor -
-

Extensor
-
 Muscle that straightens a joint.

Extensor
-

Quiz

Injury

Care of Skeletal & Muscular System

Explain how exercise improves muscular strength and flexibility.
1. Individual cells grow wider, muscle becomes thicker
2. Exercise & stretching lengthens muscles which increases flexibility

Skeletal & Muscular Systems REVIEW

Quiz
1. An adult has how many bones in their body?
a) 100 b) 300 c) 206 d) 210

Quiz
2. Some animals have skeletons on the outside of their bodies. This kind of skeleton is called an
______.
a) endoskeleton b) internal skeleton c) exoskeletons

Quiz
3. Connective tissues connect muscles to bone. These connective tissues are called _______?
a) Ligaments b) Tendons c) Exoskeleton d) cartilage

Quiz
4. Bones are attached to one another with tissue called
______.
a) ligaments b) tendons c) exoskeletons d) cartilage

Quiz
5. A soft tissue found inside some of the bones of our skeletal system is where new blood cells are made. Name of this tissue is __________.
a) marrow b) tendon c) cartilage d) ligament

Quiz
6. The elbow is an example of which kind of joint?
a) Hinge b) Ball-and-socket c) Pivot d) fixed

Quiz
7. The shoulder and upper arm are an example of which kind of joint?
a) Hinge b) Ball-and-socket c) Pivot d) fixed

Quiz
8. The bones of the skull are an example of which kind of joint?
a) ball& socket b) hindge c) pivot d) fixed

Quiz
9. Name the 3 kinds of muscles found in human beings.

Quiz
10. How are involuntary and voluntary muscles different from each other?