Contractile cells

Question 1

how many types of muscles are there

Answer 1

3- skeletal, cardiac and smooth

Question 2

where is Skeletal muscle and describe it

Answer 2

attached to bones (bicept, calf, thigh, diaphram)

Question 3

features of skeletal muscle

Answer 3

fast, rapid and strong contraction, look strippy, have many nuclei, voluntarily contraction

Question 4

features of cardiac muscle

Answer 4

heart muscle
striated
fast and strong contraction
have only one nuclei, involuntary,

Question 5

features of smooth muscle
where found

Answer 5

involved in involuntary processes
present in blood vessels, gut, airway
single nuclei
not striated
slow contraction

Question 6

compare 3 types of muscles

Answer 6

cardiac+ skeletal- striated, fast contraction, have troponin,
smooth- single nuclei, not striated, slow contraction,

Question 7

draw and label skeletal muscle

Answer 7

sarcolema, muscle fibre, muscle fascicle

Question 8

what part of brain activates muscle contraction and where does it send signal

Answer 8

sm activation is voluntary so its activated by Motor nerve
motor centre- motor nerve excited- spinal cord- muscle fibre contracts

Question 9

How does a motor nerve stimulate muscle cells?

Question 10

Describe how neurotransmitter(acetylcholine) is released and what causes it to be released

Answer 10

AP is generated in the presynaptic neurone, changes in membrane potential in the presynaptic neurone causes ca2+ channels to open
Ca2+ enters presynaptic neurone and causes vesicles to fuse with the membrane
acetylcholine is released into synaptic cleft

Question 11

where are nicotinic acetylcholine receptors located

Answer 11

motor end plate is on surface of muscle cell contain nicotinic acetylcholine receptor