1. The Muscular System Warm Up Section 3
List five body parts that you use when you drink a glass of water. Do you use any of those same body parts when you eat an apple? Do you use any of those same body parts when you pick up a heavy box?
Record your response in your science binder.
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2. The Muscular System Kinds of Muscles Section 3
Smooth, Cardiac, and Skeletal Smooth muscle is found in the digestive tract and in the walls of blood vessels. Cardiac muscle is found only in your heart. Skeletal muscle is attached to your bones for movement.
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3. The Muscular System Movement Section 3
Muscles Attach to Bones Strands of tough connective tissue connect your skeletal muscles to your bones. These strands are called tendons.
Muscles Work in Pairs Your skeletal muscles often work in pairs. The next slide shows how the biceps muscle of the arm is a flexor. The triceps muscle of the arm is an extensor.
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4. A Pair of Muscles in an Arm
Section 3
A Pair of Muscles in an Arm
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5. The Muscular System Use It or Lose It Section 3
Resistance Exercise Resistance exercise is a great way to strengthen skeletal muscles. During resistance exercise, people work against the resistance, or weight, of an object.
Aerobic Exercise Steady, moderately intense activity is called aerobic exercise. Jogging, cycling, skating, swimming, and walking are aerobic exercises.
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6. The Muscular System Muscle Injury Section 3
Muscles Attach to Bones A strain is an injury in which a muscle or tendon is overstretched or torn. People who exercise too much can hurt their tendons. Inflamed tendons is called tendonitis. Some people try to make their muscles stronger by taking drugs. These drugs are called anabolic steroids. They can cause long-term health problems.
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7. The Integumentary System
Section 4
The Integumentary System
Functions of Skin
Staying Safe Skin protects you by keeping water in your body and foreign particles out of your body.
Keeping in Touch Nerve endings in your skin let you feel things around you.
Keeping Your Cool Skin helps regulate your body temperature.
Throwing Out the Garbage Skin helps get rid of wastes.
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8. The Integumentary System
Section 4
The Integumentary System
Layers of Skin
Epidermis The epidermis is the outermost layer of skin. You see the epidermis when you look at your skin.
Dermis The thicker layer of skin that lies beneath the epidermis is the dermis. You can see the other parts of your skin in the next slide.
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9. Structures of the Skin Section 4
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10. The Integumentary System
Section 4
The Integumentary System
Hair and Nails
Dead Cells A hair forms at the bottom of a tiny sac called a hair follicle. The hair grows as new cells are added at the hair follicle. A nail grows from living cells in the nail root at the base of the nail.
Skin Injuries
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Skin Deep Skin is often damaged. Fortunately, your skin can repair itself. However, damage to the genetic material in skin cells can cause skin cancer.
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