Muscle Structure

Question 1

Which 2 muscle tissues are striated?

Answer 1

Skeletal and cardiac

Question 2

What are the properties of Skeletal muscle?

Answer 2

Skeletal muscle is a voluntary striated muscle that is attached to bone or fascia. This muscle tissue is multinucleate

Question 3

What does skeletal muscle provide?

Answer 3

Locomotion; the ability to move

Question 4

What are the properties of Cardiac muscle?

Answer 4

Cardiac Muscle is an involuntary striated muscle tissue. It is mononucleate and autorhythmic (the heart)

Question 5

What are the properties of Smooth muscle?

Answer 5

Smooth muscle is involuntary and not striated. Like Skeletal muscle it is mononucleate but controlled by autonomic nervous system

Question 6

Where can smooth muscle be found?

Answer 6

in the walls of many of our hollow organs (ex: gastrointestinal tract)

Question 7

What are the 5 properties of muscle tissue?

Answer 7

1. Excitability
2. Conductivity
3. Contractability
4. Extensibility
5. Elasticity

Question 8

What is Excitability?

Answer 8

responding to chemicals released from motor neurons (muscle cells + neurons share characteristics)

Question 9

What is Conductivity?

Answer 9

can propagate electrical signals over membrane

Question 10

What is Contractability?

Answer 10

ability to shorten in response to an action potential to generate force

Question 11

What is Extensibility?

Answer 11

ability to stretch or extend without damaging tissue

Question 12

What is Elasticity?

Answer 12

ability to return to its original shape after being stretched (elastic fibers)

Question 13

What is a muscle fiber?

Answer 13

an individual muscle cell

Question 14

What is a fascicle?

Answer 14

a group of muscle cells within the belly of a muscle

Question 15

What is a myofibril?

Answer 15

The major component of a muscle cell (takes up the most intracellular volume)

Question 16

What is the Epimysium?

Answer 16

Fibrous connective tissue that is continuous with the tendon

Question 17

Skeletal muscle tends to be long and cylindrical. True or False?

Answer 17

TRUE; the cell shape of Skeletal muscle is long and cylindrical

Question 18

Cardiac muscle is spindle-shaped. True or False?

Answer 18

FALSE; Cardiac muscle is rectangular branching cells

Question 19

What is the cell shape of Smooth muscle?

Answer 19

Spindle-shaped

Question 20

Muscle structures in order from largest to smallest

Answer 20

Muscles -> Fascicles -> Muscle cell -> Myofibrils -> Myofilament

Question 21

What is the perimysium?

Answer 21

covers fascicles

Question 22

What is endomysium?

Answer 22

covers muscle fibers

Question 23

Order of connective tissue layers on muscle (Outer to inner)

Answer 23

1. Epimysium
2. Perimysium
3. Endomysium