1 / 12

The Muscular System

Discover the importance of the muscular system in body movement, shape, and heat regulation. Learn about skeletal, smooth, and cardiac muscles, their functions, and characteristics. Explore how muscles work, produce energy, and maintain body temperature.

samuelo
Download Presentation

The Muscular System

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The Muscular System • The ability to move is an essential activity of the human body • ½ our body weight comes from muscles • Consists of over 600 individual muscles. • 3 purposes: • Body movement • Body shape • Body heat (maintain temp.)

  2. The Muscular System • Body movements are determined by three types of muscles • Smooth (involuntary) – cannot be controlled by will. • Cardiac – control the contractions of the heart. • Skeletal (Voluntary) – can be controlled by will.

  3. Function of Skeletal muscles • Attach to bones to provide voluntary movement • Tendons: strong, tough connective cords • Produce heat and energy for the body • Help maintain posture • Protect internal organs • Called striated (striped) because they have striations of alternating light and dark band

  4. Functions cont’d. • Fleshy body parts are made of skeletal muscles • Provide movements to the limbs, but contract quickly, fatigue easily and lack the ability to maintain contraction for long periods • Blinking eyes, talking, breathing, eating, dancing and writing all produced by these muscles

  5. Function of Smooth Muscle • Called smooth muscle because they are unmarked by striations, small spindle shaped • Unattached to bones, act slowly, do not tire easily and can remain contracted for a long time • Not under conscious control so they are also called involuntary muscles • Found in walls of internal organs (intestines, bladder, stomach, uterus, blood vessels)

  6. Function of cardiac muscle • Found only in the heart • Involuntary muscle • Requires a continuous supply of oxygen to function • Cardiac muscle cells begin to die after 30 seconds of oxygen cut-off • Striated and branched

  7. Characteristics of Muscles • All muscles have 3 common characteristics • Excitability – ability to respond to a stimulus (ie: nerve impulse) • Contractibility – muscle fibers that are stimulated by nerves contract (become shorter) and causes movement • Elasticity – allows the muscle to return to its original shape after it has been contracted

  8. Sources of heat/energy • When muscles work, they produce heat that our body needs to function properly • Major source of this energy is ATP – a compound found in muscle cells • Muscle cells require oxygen, glucose and other materials circulated by the blood to produce ATP. • When the muscle is stimulated, ATP is used, thus producing heat

More Related