Lesson 6, Chapter 4

Question 1

Motor neurons

Answer 1

The neurons that tell muscles to contract

Question 2

Neurotransmitter

Answer 2

A general name for the chemical secreted by neurons that will affect muscle fibers

Question 3

Motor unit

Answer 3

One motor neuron and all the muscle fibers it controls

Question 4

Neuromuscular junction

Answer 4

The presynaptic terminal of a motor neuron, the synapse, and the membrane of a muscle fiber affected by the motor neuron

Question 5

Presynaptic terminal

Answer 5

The end of a branch of a motor neuron

Question 6

Synapse

Answer 6

The space between the end of a motor neuron (the presynaptic terminal) and a muscle fiber

Question 7

Acetlycholine

Answer 7

The specific neurotransmitter secreted by a motor neuron

Question 8

Multiple motor unity summation

Answer 8

The number of motor neurons sending nervous impulses will increase when more muscle fibers need to contract

Question 9

Motor Memory

Answer 9

Gaining a skill of protein fibers found in muscle fibers

Question 10

Myofibrils

Answer 10

Smaller strands of protein fibers found in muscle fibers

Question 11

Actin and myosin

Answer 11

Filaments of protein found in myofibrils

Question 12

Sarcomere

Answer 12

A unit of two units of actin separated by one unit of myosin

Question 13

Z discs

Answer 13

Structures that connect sarcomeres to each other