The document discusses the three types of muscle tissue in the human body: skeletal, smooth, and cardiac muscle. Skeletal muscle is voluntary muscle that moves bones and is attached to bones via tendons. Smooth muscle is involuntary and found in internal organs. Cardiac muscle is only located in the heart. The document provides examples of the smallest, largest, longest, and strongest muscles as well as muscle facts about facial expressions and blinking. Diagrams identify major muscles in the arms, legs, and trunk.

1. Structure and Movement
The Muscular System

2. Figure 6.2
Slide 6.1
The Muscular System

5. The Muscular System
• A. A muscle is an
organ that can
relax and contract,
and provides the
force to move your
body parts.
• 1. Voluntary
muscles – muscles
that you are able
to control
• 2. Involuntary
muscles – muscles
that you cannot
control

7. The Muscular System
• B. There are 3 types of
muscle tissue
• 1. Skeletal muscle
moves bones
• a. Most common type
of muscle
• b. Tendons are thick
bands of tissue that
attach muscle to bone
• c. Voluntary muscles
• d. Contract quickly
and tire more easily
• e. Look striped, or
striated

8. The Muscular System
• 2. Smooth
muscles – found in
the internal organs
• a. Example:
intestines
• b. Smooth
muscles are
involuntary
muscles
• c.Contract and
relax slowly

9. The Muscular System
• 1. Cardiac muscle
• a. Found only in the
heart
• b.Cardiac muscle
is striated, like
skeletal muscle

10. MUSCLE FACTS
• Smallest muscle in the body?
Stapedius: the muscle that activates the stirrup,
the small bone that sends vibrations from the
eardrum to the inner ear. It measures just 0.05
inch (0.13 centimeter) in length.
• Largest muscle in the body?
Latissimus dorsi: the large, flat muscle pair that
covers the middle and lower back.
• Longest muscle in the body?
Sartorius: the straplike muscle that runs
diagonally from the waist down across the front
of the thigh to the knee.

11. • Strongest muscle in the body?
Gluteus maximus: the muscle pair of the
hip that form most of the flesh of the
buttocks.
• Fastest-reacting muscle in the body?
Orbicularis oculi: the muscle that encircles
the eye and closes the eyelid. It contracts
in less than 0.01 second.
• Number of muscles used to make a
smile?
Seventeen.
• Number of muscles used to make a
frown?
Forty-three.

12. • There are more than 630 muscles in
your body. On average, your body
weight is 40% muscle. Out of the 630
muscles, 30 of them are facial muscles,
which help you create all those
different faces of happiness, surprise,
joy, sorrow, sadness, fright, etc.

13. • The muscles surrounding your eye are
the busiest muscles in your body.
Research indicates that you probably
blink them more than 100,000 times a
day.
• And the biggest muscle in your body
is the gluteus maximus (your butt).

14. The Arms
1. Deltoid
abducts arm
2. Biceps brachii
flexes forearm
supinates forearm from neutral
3. Triceps brachii
extends forearm

15. The Legs
4. Sartorius
flexes hip and knee
5. Rectus femoris
extends knee
6. Gluteus maximus
extensor of hip
rotates thigh

16. 7. Biceps femoris
flexes knee
8. Gastrocnemius
flexes ankle
stabilizes ankle and knee when
standing

17. The Trunk
9. Pectoralis major
adducts humerus
10. Rectus Abdominus
produces trunk motions

18. 11. Trapezius
elevates and rotates scapula
12. Latissimus dorsi
rotates humerus

19. • Head Muscles
• frontalis
• orbicularis oculi
• orbicularis oris
• Etc.