The Muscular System

Muscle actions can be voluntary or involuntary. ​ (a)   muscles CAN be controlled and are often attached to bones. ​ Examples of this action would include the heart beating, ​and food digestion. ​ (b)   muscles can NOT be controlled. Examples include smiling, walking, and ​ (c)   .

• Voluntary
• Involuntary
• running
• Volunteer

What are the three types of muscles?

• rough

• smooth

• compact

• cardiac

• skeletal

Skeletal muscles are

• voluntary.

• involuntary.

Cardiac muscle is found in the

• lungs.

• stomach.

• colon.

• heart.

Label the muscles.

h

g

b

c

i

f

d

e

a

quadriceps

hamstrings

tricep

pectorals

deltoids

gastrocnemius

gluteus maximus

abdominals

bicep

Categorize as voluntary or involuntary.

Groups:

(a) Voluntary

,

(b) Involuntary

• quadriceps

• digestive tract

• stomach muscles

• abdominals

• bicep

• heart

• blood vessels

Organize these options into the right categories.

Groups:

(a) skeletal muscle

,

(b) smooth muscle

,

(c) cardiac muscle

• abdominals

• heart

• blood vessels

• quadriceps

• digestive tract

• stomach muscles

• bicep

About how many muscles are in the human body?

• I don't know; ask someone else!

• 200

• 600

• 800

A strong connective tissue that attaches muscle to bone is

• a rope fiber.

• a tendon.

• a blood vessel.

• a sternum.

Because muscles can contract (become shorter and thicker) and NOT extend, skeletal muscles must work

• in pairs.

• alone.

• in sunlight.

• very quickly.