BIOC34H3 Study Guide - Beta Cell

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copperdonkey58

4 May 2011

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There are 3 factors that regulate stroke volume: force of ventricular contraction: slide 7 - 8. this occurs through sympathetic innervation: ne or na act on the beta cells of the heart, which activate gs protein that transform atp into camp. (alpha cells as negative feedback, camp then acts on pka, which: acts together with increased ca to cause sarcoplasmic reticulum to release calcium, increasing intracellular calcium: cardiac nervene beta cells gs turn atp into. Camp pka open ca channels & pka increased intracellular ca contraction: increased calcium in the intracellular leads to : more calcium binding to troponin, resulting in more crossbridge formation of thick myosin and thin actin filaments. i ncrease in calcium permeability in the sarcoplasmic reticulum, resulting in release of more calcium to intracellular of cell (calcium induced ca release: edv. remember edv is when the ventricles have highest blood volume.

Related Questions

Question 1

A moderate increase in extracellular potassium will

		Increase heart rate due to a more negative E_K
		Decrease heart rate due to a more negative E_K
		Increase heart rate due to a less negative E_K
		Decrease heart rate due to a less negative E_K

Question 2

Apply Atropin will directly

		Decrease parasympathetic innervation and increase heart rate
		Increase parasympathetic innervation and decrease heart rate
		Decrease sympathetic innervation and increase heart rate
		Increase sympathetic innervation and decrease heart rate

Frog ECG is recorded using

		An electrical stimulator
		Three wires including the one that is connected to the hook
		A force transducer
		Three wires and a force transducer

Question 4

How would you differentiate atrial contractions fromventricular contractions?

	A.	Observe the heart beating and tap the table to label it
	B.	From the size of the contractions
	C.	Correlate it with the electrical trace, if the electrical traceis typical.
	D.	Both A and C

Question 5

In this week's experiment, _________signal(s) will be recordedto study the frog cardiac functions.

		mechanical (contractile)
		electrical (ECG)
		both mechanical and electrical
		blood flow

Question 6

In this week's experiment, the heart is hooked at the________

		either atrium or ventricle
		ventricle
		atrium

		sympathetic/increase
		parasympathetic/decrease
		Sympathetic/decrease
		parasympathetic/increase

Question 8

The frog heart can be slowed or stopped by over stimulation ofthe vagus nerve. When apply ACh to the heart, if the frog heartstop beating, you should

		Wash the heart with warm Ringers
		Apply a few drops of Isuprel
		Massage the heart
		All of the above
		Observe the trace and do nothing

Question 9

The pacemaker in the frog heart is the __________ and thepacemaker in the mammalian heart is the ________

		AV, SA node
		SV, SA node
		SA, SV node
		SA, SA node

Question 10

Which of the following statements is TRUE regarding the frogheart

		There is no autorhythmic cells found in the frog ventricle.
		Oxygenated and deoxygenated blood are mixed completely insidethe frog ventricle
		There are two atria and two ventricles.
		Deoxygenated blood flows to the frog lungs and skin.

yellowbadger252

Suppose the extracellular concentration of potassium increased in a human tissue or organ. Please indicate whether the following parameters would increase, decrease, or remain the same.

1. membrane potential

2. force of muscular contraction

3.threshhold of nerve cell membrane

4.commerce through K+ leak channels

5. the rate of glucose transport

What happens to the membrane potential when:

K⁺ permeability is increased?

Na⁺ permeability is increased?

Extracellular K+ concentration is increased?

Intracellular Na⁺ concentration is increased?

Intracellular K⁺ concentration is decreased?

pucelion917

BIOC34H3 Study Guide - Beta Cell

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