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39.3 The Muscular System -- Part 3
Contraction continues until nerve impulses stop and calcium is returned to their storage sites.
The sarcoplasmic reticulum contains active transport proteins that pump calcium ion back into the calcium storage sites.
calcium can't be pumped back into the sarcoplasmic reticulum and myosin heads can't detach from actin.
The skeleton of arthropods and vertebrates helped them colonize the environment.
The overall shape of an animal's skeleton is adapted to its environment.
The human skeleton gives support to the body, protects internal organs, provides sites for muscle attachment, as well as a site for blood cell formation.
Cartilaginous bones in the fetus are converted to bone during development.
There is a cartilaginous growth plate between the primary ossification center in the middle and the secondary centers at the ends of the bones.
Growth of the bone is possible if the growth plates are present, but eventually they are converted to bone.
The length of muscles can be changed by contracting and relaxing.
Skeletal muscles can only be shortened when they contract.
If one muscle flexes the joint and brings the limb to the body, the other will extend the joint and make the limb straight.
The muscles are made of muscle fibers.
The energy for muscle contraction is supplied by myosin.
For sustained exercise, cellular respiration is required.
Nerves in muscles.
The sarcoplasmic reticulum is where calcium is stored.
After that, calcium ion are released and bind to troponin.
The troponin Ca2+ complex shows myosin binding sites when tropomyosin threads shift their position.
There are many myosin molecules in myosin filaments.
When myosin heads break down, they are ready to attach to actin.
Myosin heads are affected by the release ofADP + P. The power stroke causes the actin to move towards the center of the sarcomere.
The heads detach from actin when more ATP molecule bind to myosin.
Pick the best answer for the question.
The human skeleton does not produce blood cells.
There is a storage area for fat.
The ribs articulate with the a. lumbar vertebrae.
Match each bone to the location in the key.
When muscles contract, they shorten.
Acetylcholine is not active at the neuromuscular junctions.
Use the terms myofibril, Z line, T tubule, sarcomere, sarcolemma and sarcoplasmic reticulum to label this diagram of a muscle fiber.
Between the sarcolemma and the outer myofilaments of the muscle is where the dystrophin is located.
The force of the muscle contraction comes from the myofilaments to the tissue of the muscle.
The symptoms of muscular dystrophy can be caused by a variation in thisProtein.
Muscular dystrophy is a disease in which the muscles lose mass over time.
Similar to the activity in our muscle cells, certain bacteria can use sugars by aerobic cellular respiration or by fermentation.
Like muscle cells, thesebacteria only use fermentation when there isn't enough oxygen in the air.
The importance of calcium consumption for the prevention of osteoporosis is emphasized by most authorities.
In some countries, osteoporosis is rare, such as China, where calcium intake is lower than in the United States.
The studies point to the higher level of animal meat in the US as having a negative effect on bone mass.
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