week 9 #1

Question 1

Neurons

Answer 1

sends electrical signals along the plasma membrane& signal other cells by using chemical messages

Question 2

Sensory neurons

Answer 2

Neurons that feel specific stimuli

Question 3

Interneurons

Answer 3

Neurons that send signals from other neurons and combine information

Question 4

Dendrite

Answer 4

Neuron’s signal-receiving cytoplasmic extension

Question 5

Axon

Answer 5

transmits electrical signals & chemical signals at its endings

Question 6

resting potential

Answer 6

(potential energy) the electrical hill across the membrane of a resting neuron

Question 7

Threshold potential

Answer 7

causes action potential by voltage-gated sodium channels in a neuron axon

Question 8

Neurotransmitter

Answer 8

Chemical signal, stored in synaptic vesicles, released into the synaptic cleft by a neuron’s axon endings

Question 9

Nerves

Answer 9

Axons bundled in connective-tissue sheaths

Question 10

Peripheral nervous system

Answer 10

Nerves that extend through the body and carry signals to and from the central nervous system

Question 11

Somatic nervous system

Answer 11

Nerves that control skeletal muscles and relay signals from joints and skin

Question 12

Sympathetic neurons

Answer 12

Dominate in a fight-flight situation

Question 13

Spinal cord

Answer 13

connects peripheral nerves with the brain

Question 14

Cerebellum

Answer 14

Region that coordinates voluntary movement

Question 15

Medulla oblongata

Answer 15

Region that controls breathing rhythm and reflexes

Question 16

Cerebrum

Answer 16

Region that controls higher functions

Largest part of the human brain;

Question 17

Thalamus

Answer 17

Sorts sensory signals and sends them to the proper region of the cerebral cortex

Question 18

Hypothalamus

Answer 18

Homeostatic control center; interacts with pituitary