1. Skeletal2. Muscular3. Circulatory4. Nervous5. Respiratory6. Digestive7. Excretory8. Endocrine9. Reproductive10. Lymphatic (Immune)

Review of the 10 Human Body Systems

from Greek: hómoios, "similar"; and stásis, "standing still“

The ability or tendency of an organism or cell to maintain internal equilibrium by adjusting its physiological processes.

You have more than 600 muscles in your body!!

Identify functions of the muscular system Identify types and important muscles Describe how muscles work with bones to

create movement Describe how muscles work like levers Recall Muscle Diseases & problems

1. Provides stability and posture2. Motion (walking, swimming, facial

expressions..etc.)3. Heat Production (shivering)4. Aids in circulation & digestion

Skeletal muscles are attached to bone by thick bands of tissue called tendons

Muscles aremade of smallmuscle fibers

Involuntary◦ Muscles you can’t

control◦ Cardiac & Smooth

Muscle◦ Ex. Heart, muscles

that help digest food

Voluntary◦ Muscles you can

control◦ Striated Muscle◦ Ex. Bicep,

Quadriceps

*Contraction & Relaxation

*Muscles Work in Pairs

*p. 160

Muscles work like levers 3 Types: 1st Class, 2nd Class & 3rd Class

In a first class lever, the weight and force are on opposite sides of the fulcrum:

Examples of this lever include scissors, crowbars, andteeter-totters.

An example of a first-class lever is the joint between the skull and the atlas vertebrae of the spine: the spine is the fulcrum across which muscles lift the head.

In the second class lever, the load is between the fulcrum and the force:

An example of this lever is a wheelbarrow. An example in the human body of a second-class lever is

the Achilles tendon, pushing or pulling across the heel of the foot.

In the third class lever, the force is between the fulcrum and the load 

Examples of this lever class include: a pair of finger-nail clippers or tweezers.

An example of a third-class lever in the human body is the elbow joint: when lifting a book, the elbow joint is the fulcrum across which the biceps muscle performs the work.