The Systems of the Human Body. 1. Skeletal 2. Muscular 3. Circulatory 4. Nervous 5. Respiratory 6....
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Transcript of The Systems of the Human Body. 1. Skeletal 2. Muscular 3. Circulatory 4. Nervous 5. Respiratory 6....
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1. Skeletal2. Muscular3. Circulatory4. Nervous5. Respiratory6. Digestive7. Excretory8. Endocrine9. Reproductive10. Lymphatic (Immune)
Review of the 10 Human Body Systems
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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.
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You have more than 600 muscles in your body!!
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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
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1. Provides stability and posture2. Motion (walking, swimming, facial
expressions..etc.)3. Heat Production (shivering)4. Aids in circulation & digestion
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Skeletal muscles are attached to bone by thick bands of tissue called tendons
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Muscles aremade of smallmuscle fibers
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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
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*Contraction & Relaxation
*Muscles Work in Pairs
*p. 160
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Muscles work like levers 3 Types: 1st Class, 2nd Class & 3rd Class
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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.
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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.
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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.