Muscle Tissue

Question 1

What are the different types of muscle tissue?

Answer 1

Skeletal, cardiac, and smooth muscle

Question 2

Where is smooth muscle found?

Answer 2

Blood vessels and provides elasticity, contractility and support

Question 3

What does muscular tissue consist of?

Answer 3

Myocytes (muscle cells)

Question 4

What are the 4 properties of muscle cells?

Answer 4

Contractility, excitability, extensibility, & elasticity

Question 5

What is contractility?

Answer 5

Ability of proteins to draw together

Question 6

What is excitability?

Answer 6

Responding to certain stimuli by producing electrical signals

Question 7

What is extensibility?

Answer 7

Stretching 3x resting length

Question 8

What is elasticity?

Answer 8

They return to original shape after contraction or extension

Question 9

What is skeletal muscle tissue made from?

Answer 9

Long cells - fibres
- Striations - contractile machinery - combines actin and myosin filaments

Question 10

What is important to remember about skeletal muscular tissue?

Answer 10

They have stratified voluntary muscle - the require input from the nervous system but we can determine when we want to move it

Question 11

What does the skeletal muscle tissue consist of?

Answer 11

Tissue, blood vessels, and nerves

Question 12

What is the substance that connects the tissue to bones?

Answer 12

Fascia is the band of thin, fibrous connective tissue that wraps around and supports every structure in your body.

Question 13

What are the bundles of muscle fibres called?

Answer 13

Vesicles = A small sac formed by a membrane and filled with liquid.

Question 14

What must have a muscle cell?

Answer 14

A nucleus, protein myosin, the plasma membrane - sarcolemma, mitochondria (lots of them); glycogen (used by them to provide ATP)

Question 15

What do the muscle cells consist of?

Answer 15

Thick myosin filaments in the cell that are both involved in the contraction feature

Question 15

Why is the sarcoplasm reticulum important?

Answer 15

Protection?

Question 15

Myofibrils are?

Answer 15

Arranged into sections called sarcomeres

Question 15

How does the smooth muscle differ from cardiac and skeletal?

Answer 15

Has no striations - diff organisation of actin & myosin filaments
-gap junctions - quick communication between cells

Question 15

Describe cardiac muscle

Answer 15

• Muscle fibres are branched, striated fibres - only one nucleus/mononucleate
• Cell connections at intercalated discs
• Striated involuntary muscle

Question 15

Is cardiac muscle a volunary muscle?

Answer 15

No, striated involuntary muscle because we do not remember and we have regular contractions in the cardiac muscles.

Question 16

What classification is the smooth muscle?

Answer 16

Non-striated involuntary muscle

Question 17

What makes the smooth muscle different from cardiac?

Answer 17

Actin and myosin filaments not held in sarcomere formation
- do not have obvious striations

Question 18

Name 2 characteristics of the smooth muscle

Answer 18

Single nucleus, & cells have tapered ends

Question 19

What is a sarcomere?

Answer 19

The functional unit of a muscle cell.

Question 20

What type of muscle tissue is characterized by multinucleated cells?

Answer 20

Skeletal

Question 21

What unique characteristic of cardiac muscle allows it to contract rhythmically without external stimulation?

Answer 21

Correct answer:

Intercalated disks

Question 22

Which of the following statements is true?

Answer 22

Skeletal muscles are striated tissues under voluntary control.

Question 23

What is the primary function of smooth muscle?

Answer 23

Involuntary movement of internal organs

Question 24

What are the main parts of a myofibril?

Answer 24

Actin and myosin