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A & P 2 LAB > 2/26- Frog Heart (Exam 2) > Flashcards

2/26- Frog Heart (Exam 2) Flashcards

1
Q

What is the little hump?

A

Atrial contraction

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2
Q

What is the big hump contraction?

A

Ventricular contraction

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5
Q

What does the ringers solution at 23 C do?

A

Normal heart rate

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6
Q

What does the ringers solution at 32 C do?

A

Heart rate speeds up

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7
Q

What do the ringers solution at 5 C do?

A

Heart rate slows down

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8
Q

What 2 chemicals speed up a frogs heart?

A

1) epinephrine

2) atropine

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9
Q

What 2 chemicals slow the heart rate of a frog?

A

1) pilocarpine

2) digitalis

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10
Q

What does pilocarpine act like?

A

Acetylcholine

Parasympathetic nerves

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11
Q

What does epinephrine act like?

A

Sympathetic nerves

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12
Q

What does atropine act like?

A

Blocks action of acetylcholine

Blocks Neurotransmitter of parasympathetic nerves

Fight or flight

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13
Q

What does a single electrical impulse near the ventricular contraction will result in?

A

Double systole

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14
Q

What is the pause called when double systole happens?

A

Compensatory pause

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15
Q

What happens when calcium ions is added?

A

Ventricular contraction is slightly stronger than normal

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16
Q

What is excess blood calcium levels known as?

A

Hypercalcemia

Prolongs plateau phase of cardiac muscle action potentials

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17
Q

What happens with sodium ions?

A

Ventricular contraction is slightly weaker than normal

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18
Q

What is excess blood sodium levels known as?

A

Hypernatremia

Inhibits calcium transport into cardiac muscles weakening heart contractions

19
Q

What happens when potassium ions are added?

A

Stops atrial contraction completely

Ventricular contractions are weaker

20
Q

What is excess blood potassium levels known as?

A

Hyperkalemia

Extra K lowers the resting potential and interferes depolarization

22
Q

What happens with an electrical stimulation of the vagus nerve?

A

Heart slows down and weakens

Eventually heart stops but then begins on its own

23
Q

What is it called when the vagus nerve stops the heart and then starts again?

A

Vagal Escape

A & P 2 LAB (7 decks)

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