27. Schwann cells make myelin in the a CNS e. ENS 28. True or False: Much of the

Question

27. Schwann cells make myelin in the a CNS e. ENS 28. True or False: Much of the energy expended by ncurons, and really all cells of the body, is used to create a nct negative charge in the inside of the cell as compared to the outside of the cell. 29. When ion channels are open, they allow specific ions to move across the plasma membrane, down their .. a. electrochemical gradient b gradients based on ratio and quotient specificity c. the statement is wrong it doesn't move down, it moves up 30. True or False: cations move toward a positively charged area - the electrical and natural aspect of the gradient. Negatively charged anions move toward a positively charged area, and positively charged char 31, Thespu the pre and posts,naptKkN..called. Leak b. Ligand gated channels c. cleft 32. Which of these generates the action potential that occurs in the postsynaptic membrane? a. Ca+ b. nucrotransmitters c. Voltage-gated channels d. Mechanically gated channels .channels respond to mechanical deformation (applying pressure to a receptor) a. Leak b. Ligand gated channels c. Voltage-gated d. Mechanically gated e. 34. What is the equilibrium potential for Na? a. 60 mv b. +60 mv c. -90 mv d. 90 mv 35. At any given point how many anions lie outside of the cell? a. 0 b. 65 c.-70 mv Are both of these statements true: The gray matter of the cord is a site for integration of postsynaptic potentials (IPSPs and EPSPs). The white matter of the cord contains major sensory and motor tracts to and from the brain. 36.

Explanation / Answer

27) The correct option is b. PNS.

Schwann cells are supporting cells of the peripheral nervous system. These cells make myelin.

28) The given statement is true.

Energy expended by neurons. All cells help in the formation of a net negative charge in the inside of the cell as compared to the outside of the cell.

29) The correct option is a. electrochemical gradient.

When ion channels are open, they allow specific ions to move across the plasma membrane and down their electrochemical gradient from high to low concentration.

30) The given statement is false.

Positively charged cations move toward a negatively charged area and negatively charged anions

move toward a positively charged area.

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