Lab 6 Properties of Skeletal Muscle

Question 1

contractile units

Answer 1

sarcomeres

Question 2

skeletal muscles are consists of

Answer 2

myofobrils

Question 3

muscle fiber represents a

Answer 3

muscle cell

Question 4

muscle cell enclosed by

Answer 4

sarcomella

Question 5

what are found inside muscle cells?

Answer 5

motochondria, nuclei, sarcoplasmic reticulum

Question 6

stores the ionic calcium required for contraction

Answer 6

sarcoplasmic reticulum

Question 7

group of muscle fibers

Answer 7

motor unit

Question 8

muscles are stimulated by

Answer 8

single nerve

Question 9

where nerve terminates in

Answer 9

motor end plate

Question 10

neurotransmitter at the neuromuscular junction

Answer 10

acetylcholine

Question 11

minimum of threshold intensity is necessary to before any contraction takes place

Answer 11

true

Question 12

increase intensity of stimuli

Answer 12

increase contraction

Question 13

accumulation of this product = muscle fatigue

Answer 13

lactic acid

Question 14

fatigue= depletion of this

Answer 14

ATP

Question 15

repeated stimulation will result in a reduction of the amount of neurotransmitters

Answer 15

Wedensky inhibition/ fatigue of the myoneural junction

Question 16

certain drugs to block or abolish ( blocking acetylcholine receoptors) neurotransmission while others enhance it

Answer 16

myoneural block

Question 17

enhance muscular activity - slow down use of

Answer 17

physostigmine

Question 18

neurotransmitters may be inhibited from release at the neuromuscular junction by

Answer 18

botulinum toxin