Exam 3 deck 4

Question 1

What muscle is primarily responsible for preventing foot drop?

Answer 1

Extensor digitorum longus

Question 2

What is the main factor that determines the power of a muscle?

Answer 2

The total number of muscle cells available for contraction

Question 3

What is a muscle that provides the major force for producing a specific movement called?

Answer 3

An agonist

Question 4

Which of the following muscles is not a rotator cuff muscle ?
A. Subscapularis
B) teres minor
C) supraspinatus
D) levator scapulae

Answer 4

D- levator scapulae

Question 5

Connective tissue covering a bundle of muscle fibers

Answer 5

Perimysium

Question 6

Bundle of muscle fibers

Answer 6

Fascicle

Question 7

Contractile unit of muscle

Answer 7

Sarcomere

Question 8

A muscle cell

Answer 8

Myofilament

Question 9

Thin areolar connective tissue surrounding each muscle fiber

Answer 9

Endomycium

Question 10

Plasma membrane of the muscle fiber

Answer 10

Sarcolemma

Question 11

A long organelle with a banded appearance found within muscle fibers

Answer 11

Myofibril

Question 12

Actin or myosin containing structure

Answer 12

Myofilament

Question 13

Cord of collagen fibers that attaches muscle to a bone

Answer 13

Tendon

Question 14

Why is the connective tissue wrappings of skeletal muscle important?

Answer 14

It increases coordination, adds strength, and serves as a route for entry and exit of blood vessels/nerves to muscle

Question 15

Why are there more indirect muscle attachments to bone than direct?

Answer 15

hey can get through prominences that would destroy other delicate tissues and can easily pass over joints

Question 16

How does an aponeurosis differ from a tendon structurally?

Answer 16

Tendons attach muscle to bone and aponeurosis attaches muscle to muscle

Question 17

How is aponeurosis functionally similar to a tendon?

Answer 17

They both function to connect muscle to something

Question 18

The junction between a motor neurons axon and the muscle cell membrane is called a ____ junction.

Answer 18

Neuromascular

Question 19

A motor neuron and all of the skeletal muscle fibers it stimulates is called a ______.

Answer 19

Motor unit

Question 20

The actual gap between the axon terminal and the muscle fiber is called a ______.

Answer 20

Synaptic cleft

Question 21

When the _______ reaches the ends of the axon the neurotransmitter is released and diffuses to muscle cell membrane to combine with receptors there.

Answer 21

Action potential

Question 22

The combining of the neurotransmitter with the muscle membrane receptors causes a change in permeability of the membrane resulting in _______ of the membrane.

Answer 22

Depolarization

Question 23

Within the axon terminal are many small vesicles containing a neurotransmitter substance called ________.

Answer 23

Acetylcholine

Question 24

Botulinum toxin binds to receptors present at the axon terminal in order to enter the neuron. What vesicular transport process do you think is involved in the toxin entering the neuron?

Answer 24

Endocytosis

Question 25

How does botulinum toxin alter the normal sequence of events at the neuromuscular junction to result in paralysis?

Answer 25

Clostridum botulinum secretes a toxin that blocks acetylcholine from the axon terminal resulting in paralysis.