Lec 2 - The Heart Flashcards

1
Q

list the differences between excitation of vertebrate striated muscle and cardiac muscle

A

initial cause of depolarisation, time course of AP, propagation of AP along sarcolemma, cellular origins of Ca2+

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2
Q

voltage gated ca2+ channels open to cause an increase in cytoplasmic Ca2+ only in

A

cardiac cells

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3
Q

what is special about the refractory period in cardiac muscle

A

it is a prolonged effective refractory period to allow full emptying of the heart

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4
Q

what does myogenic mean

A

that it is beginning in the muscle, spontaneous

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5
Q

list two properties of pacemaker cells

A

they depolarise fastest and have an unstable resting potential

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6
Q

neurogenic means

A

beginning in the nerve

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7
Q

what are neurogenic neurons excited by

A

neurotransmitters from motor nerves

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8
Q

what two types of innervation sites can skeletal muscles have

A

multiple (tonic) or single (twitch)

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9
Q

muscle contraction depends upon

A

intracellular calcium

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10
Q

skeletal muscle sarcoplasmic reticulum can be described as being

A

highly developed

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11
Q

cardiac myocyte sarcoplasmic reticulum t tubules are not so well developed because

A

the signal travels through gap junctions

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