Homework answers / question archive / University of Illinois, Chicago NURS 531 Chapter 4: How drugs act: cellular aspects-excitation, contraction and secretion MULTIPLE CHOICE 1)L(long-lasting)-type calcium channels are correctly described as having   low activation threshold and slow inactivation high activation threshold and slow inactivation low activation threshold and fast inactivation high activation threshold and fast inactivation none of the above as correct     2

University of Illinois, Chicago NURS 531 Chapter 4: How drugs act: cellular aspects-excitation, contraction and secretion MULTIPLE CHOICE 1)L(long-lasting)-type calcium channels are correctly described as having   low activation threshold and slow inactivation high activation threshold and slow inactivation low activation threshold and fast inactivation high activation threshold and fast inactivation none of the above as correct     2

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University of Illinois, Chicago

NURS 531

Chapter 4: How drugs act: cellular aspects-excitation, contraction and secretion

MULTIPLE CHOICE

1)L(long-lasting)-type calcium channels are correctly described as having

 

1. low activation threshold and slow inactivation
2. high activation threshold and slow inactivation
3. low activation threshold and fast inactivation
4. high activation threshold and fast inactivation
5. none of the above as correct

 

 

2.    The extrusion of calcium from the cell cytoplasm primarily depends on

 

1. ligand-gated calcium channels
2. voltage-gated calcium channels
3. the sodium-calcium exchange transporter
4. the ATP-driven calcium pump
5. nuclear sequestration

 

 

3.    The mechanism by which monamine neurotransmitters are released from nerve terminals is

 

1. calcium-mediated exocytosis
2. carrier-mediated release
3. ATP-dependent active transport
4. diffusion through aqueous pores
5. diffusion through membrane lipid

4.    Batrachotoxin binds sodium channels and thereby

 

1. opens channels
2. prevents channel opening
3. prevents channel inactivation
4. closes channels
5. causes channels to remain closed 5.        Closure of potassium channels in excitable membranes causes membrane

 

1. repolarization
2. depolarization
3. hyperpolarization
4. disintegration
5. inactivation