Upgrade to remove ads
Terms in this set (12)
an organ that can relax, contract and provide the force to move your body parts.
how many muscles does the human body have?
muscles that you can control
muscles that you cannot control
what organs are used like a lever in your body
bones and joints. Bones are the rods, joints are the fulcrum and the
muscles provide the force.
3 classes of levers your body uses -
a. first class lever: between input and output force (neck putting head back)
b. 3rd class lever :input force is between fulcrum and output (elbow bending)
c. 2nd class lever :output force lies between the fulcrum and input (standing on tip toes)
the three types of muscles
a. skeletal muscles : move bones, striated and are voluntary. Attached to the bones.
b. cardiac muscle : found only in the heart. Is striated. Contracts heart to 70 times per minute. Involuntary.
c. smooth muscle : found in bladder, intestine, blood vessels and other internal organs. It is not striated. Involuntary, organs are made of one or more layers of this muscle.
- thick bands of tissue that attaches skeletal muscles to the bones
how muscles work
- Pair of muscles work together. When one contracts the other of the pair relaxes. They will pull and never push.
how muscles can become larger- The more you use the larger they can get. Can also have increase in number of muscle cells.
- The more you use the larger they can get. Can also have increase in number of muscle cells.
how muscles can become smaller
- If not used the muscle will shrink
how muscles move
- Chemical energy is moved to the muscles by the blood. It is released into the muscle. When the muscle contracts it changes to mechanical energy (movement) and thermal energy (warmth :keeps body temperature constant). The muscle will tire when the chemical energy runs out. Rest allows the blood to supply more chemical energy to the muscles.
YOU MIGHT ALSO LIKE...
The muscular System test
Chapter 14 lesson 2 Science - Cameron