Neurons & Glial Cells

Question 1

Astrocytes:

Answer 1

HAS PROJECTIONS; MOST ABUNDANT; TOUCH CAPILLARY WALLS AND NEURONS; ENDS OF PROCESSES (PERIVASCULAR FEET) COVER CAPILLARIES IN BRAIN TO FORM BLOOD BRAIN BARRIER

Question 2

Oligodendrocytes:

Answer 2

LARGE, BULBOUS; SLENDER CYTOPLASMIC PROJECTIONS; ENCASES PORTIONS OF AXON; FORM MYELIN SHEATH

Question 3

Ependymal cells:

Answer 3

CILIATED SIMPLE COLUMNAR/CUBOIDAL CELLS THAT LINE INTERNAL CAVITIES OF SPINAL CORD & BRAIN; CREATES CEREBROSPINAL FLUID (CSF)

Question 4

Microglial cells:

Answer 4

SMALL; TINY BRANCHES THAT EXTEND OFF OF CELL BODY; PHAGOCYTIC; IMMUNE FUNCTION; CLEAN UP DAMAGED NERVOUS TISSUE

Question 5

What glial cells are in the CNS? In the PNS?

Answer 5

CNS: astrocytes, oligodendrocytes, ependymal cells, and microglial cells. PNS: Satellite and Nuerolemmocytes

Question 6

Satellite:

Answer 6

FLAT; AROUND NEURON CELL BODIES IN GANGLION; REGULATE EXCHANGE OF WASTE AND NUTRITION BETWEEN NEURONS AND ENVIRONMENT

Question 7

Neurolemmocytes:

Answer 7

FLAT; AROUND AXONS; INSULATION AND PROTECTION

Question 8

Receptive segment:

Answer 8

RECIEVES STIMULI FROM DENDRITES; INCLUDES DENDRITES AND CELL BODY; CHEMICALLY GATED CATION, K+, AND CL- CHANNELS

Question 9

Initial segment:

Answer 9

AXON HILLOCK; Na+ AND K+ VOLTAGE GATED CHANNELS

Question 10

Conductive segment:

Answer 10

EQUAL TO LENGTH OF AXON; Na+ AND K+ VOLTAGE CHANNELS

Question 11

Transmissive segment:

Answer 11

Ca+ VOLTAGE CHANNEL AND Ca+ PUMP; SYNAPTIC BULB

Question 12

Resting membrane potential of a neuron:

Answer 12

-70 mV

Question 13

What are graded potentials?

Answer 13

LOCAL ELECTRICAL CHANGES IN RMP; DENDRITES & CELL BODY