Homework #3 is due now. Bonus #3 is

Homework #3 is due now. Bonus #3 is

Homework #3 is due now. Bonus #3 is due F 4/27. Nervous System Signaling Stimulus Transduction

Integration Transmission Response Muscles allow

movement An earthworm: without something to push against, muscles are not much use. CB 49.25

The skeleton, made of bones, gives support CB 49.26 Bones

are alive Connections between bones and muscles

Muscles can only contract. Therefore, two muscles are needed for each range of motion. CB 49.27 2 nerve signals for every movement:

excitatory and inhibitory CB 49.27 How do muscles

contract? Muscle cells are comprised of series of sarcomeres.

CB 49.28 Muscle cells are comprised of series of sarcomeres

CB 49.32 Each sarcomere is a repeating

unit of actin and myosin proteins CB 49.28

As each sarcomere contracts, the muscle contracts CB 49.28

Neurotransmitters released at nerve/ muscle junction cause calcium to be

released in muscle CB 49.32 A third protein,

tropomyosin controls when the muscle contracts CB 49.31

ATP provides the energy for myosin movement along the actin

CB 49.30 CB 49.32 How do muscles contract? http://health.howstuffworks.com/adam-200006.htm

(if you have a strong stomach, this video shows muscle contraction using a naked man and a cadaver) http://youtube.com/watch?v=nqGyilzp1FQ

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