6. An IPSP (Inhibitory post-synaptic potential) is? a. A physiological response

Question

6. An IPSP (Inhibitory post-synaptic potential) is? a. A physiological response to stress b. An epileptic seizure c. A graded depolarization of the plasma membrane d. A graded hyperpolarization of the plasma membrane 7. The overshoot or hyperpolarization of the plasma membrane at the end of an action potential is due to? The relatively slow closing of the voltage-gated potassium channels The relatively slow closing of the voltage-gated sodium channel inactivation gates The relatively slow closing of the voltage-gated sodium channel activation gates The relatively fast closing of the voltage-gated sodium channel activation gates a. b. d. e. 8) Major muscle function(s) include? a) b) c) d) e) Movement Maintain posture Stabilize Joints Generate heat All of the above The cells responsible for forming the myelin sheath in the white matter of the brain are called while the cells making up the myelin sheath in the 9) peripheral nervous system are called

Explanation / Answer

6)An IPSP(Inhibitory Post Synaptic Potential) is to hyper polarize the post synaptic membrane.This occurs when neurotransmitter bind to the receptor.The neurotransmitter binds to the ionotropic receptor the potassium channels open .There is ahigher concentration of potassium in cytosol of the cell and lower concentration in the extracellular fluid.So potassium moves out of the cell that is potassium efflux.So membrane potential becomes more negative than rest.So it hyper polarize the membrane.

So,answer is d)

7)The overshoot or hyperpolarization of the plasmamembrane at the end of the action potential is due to the relatively slow closing of the voltage gated potassium channels.The movement of potassium out of the cell makes the TP even more negative than it used to be and it is hyper polarization.

So,answer is a)

8)Major muscle function include

Contraction of skeletal muscles produces voulantary gross and fine movements this the primary function of muscular movement.Axial skeletal muscles are important for twisting head and body and for maintaining upright postion.They provide skeletal stability.Skeletal muscle activity increases to generate heat when body temperature decreases.

Hence answer is e)

9)The cells responsible for forming the myelin sheath in the white matter of the brain are called oligodendrocytes,while the cells making up the myelin sheath in the peripheral nervous system are called Schwann cells

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