lab seven: powerlab one - muscle structure, function and electromyography

Question 1

frequency

Answer 1

number of occurrences of a repeating event per unit time

Question 2

amplitude

Answer 2

height of the wave from baseline to crest

Question 3

waveform

Answer 3

shape and form of a signal

Question 4

wavelength

Answer 4

length from the crest of one peak to the crest of the next peak

Question 5

what are the three muscle tissue types?

Answer 5

skeletal, smooth, cardiac

Question 6

myo, mys, sarco

Answer 6

prefixes that refer to muscle

Question 7

skeletal muscle

Answer 7

do the majority of the work for locomotion and support of the animal skeletal, making up about 40% of the cell mass of the body

*VOLUNTARY

Question 8

one muscle cell

Answer 8

made up of muscle fibers organized into fascicles

Question 9

muscle fibers

Answer 9

muscle cells

Question 10

muscles use the chemical energy stored in _____, to produce mechanical energy in directed movements

Answer 10

ATP

Question 11

patients with loss of muscle function is most commonly a consequence of what?

Answer 11

upper motor neuron lesions

Question 12

upper motor neuron lesions

Answer 12

strokes damaging neurons in the brain

Question 13

excitability

Answer 13

muscle cell membranes having an electric charge differential which can be changed upon stimulation (such as through neurotransmitters binding) to ultimately produce an intracellular muscle response

Question 14

contractility

Answer 14

muscle cells shortening when stimulated

Question 15

extensibility

Answer 15

muscles cells stretching, sometimes more than their resting length

Question 16

elasticity

Answer 16

muscle cells, after being stretched, recoil to the resting cell length

Question 17

an entire muscle will also have within it, _____, _____, and _____

Answer 17

nerves, blood vessels, connective tissue

Question 18

how do nerves and blood vessels enter the muscle?

Answer 18

near its center; then they branch throughout the muscle running through the connective tissue sheaths epi-, peri-, and endomysium

Question 19

tendons

Answer 19

connective tissues that attach muscle to bone