The Muscular System

Chapter 4

Lesson 2

Bone quiz #1

Write and answer the following questions:

1.Roughly how many bones are in the human body?

2.Describe the composition of spongy bone.

3.Describe the function of compact bone.

4.Name the structures of the axial skeleton.

5.Name the structures of the appendicular skeleton.

6.What organs are protected by the axial skeleton?

7.Describe how muscles and bones work together to create movement.

Describe the 5 functions of the skeleton.

Science Words

• Muscle• Voluntary muscle• Involuntary muscle• Skeletal muscle• Tendon• Smooth muscle• Cardiac muscle

Moving the human body

Muscle-an organ that contracts and gets shorter- this provides the force to move your body parts.

Muscles of thebody

Muscle Control

• Voluntary muscles- muscles that you are able to control.

• Examples are leg and arm muscles

• Involuntary Muscles- you can not move them consciously. They just keep working.

• Example- heart

Types of Muscles

*Smooth

*Cardiac

*Skeletal

Smooth Muscles• Smooth muscles are

non-striated

• Involuntary movement

• Move the internal organs

• Contract and relax slowly.

• Example- small intestine

Cardiac Muscle

• Cardiac muscle are found only in the heart.

• Involuntary movement.

• Striations

• Contracts about 70 times a minute every day of your life.

Skeletal Muscles

• Skeletal Muscles-muscles that move bones.

• Attached to the bones by tendons.

• Most numerous in the body.

• Look striped or striated.

• Voluntary muscles.

How Muscles Work• Skeletal muscles-when one

muscles contracts- another muscle relaxes.

• Muscles always pull- never pushes.

• Muscles use glucose (sugar)• Produce energy when they

contract.• Muscles that are not

exercised become smaller.

Muscles and bones work together