Chapter 10: Muscular Tissue

Question 1

What are the special properties we find in muscular tissue

Answer 1

1. Excitability
2. Contractibility
3. Extensibility
4. Elasticity

Question 2

What does it mean for a muscle to be excited

Answer 2

To go from polarized to depolarized

Question 3

What does contractility mean

Answer 3

Tightening or shortening a muscle

Question 4

What is Extensibility

Answer 4

Allows muscle cells to be stretched

Question 5

What is Elasticity

Answer 5

Ability to recoil or bounce back a muscle to original length after being stretched

Question 6

Describe Smooth muscles

Answer 6

• Do not contain striations ( NON-striated)
• Spindle shaped and unnucleated (one nucleus)
• Found in the wall of the blood vessels, stomach, intestine, in the wall of hollow organs!!!
• Involuntary control (Autonomic control) we can’t control it

Question 7

Describe Cardia muscles

Answer 7

• Striated and Branched
• Unnucleated
• Intercalated disc
  
  • Desmosome= hold the muscle together
• Gap junctions= Allows for easier communication between muscles and form a wave like pattern
• Involuntary (Think of the heart)

Question 8

Describe Skeletal Msucle

Answer 8

• Voluntary movement (Somatic)
• Multinucleated, tubular, and striated
• Very long
• Attached to skeleton

Question 9

Important to remember

Answer 9

Cell division of cardiac and skeletal muscle DOES NOT HAPPEN after birth only BEFORE

Question 10

Important to remember 2

Answer 10

Smooth muscle can undergo cell division AFTER birth

Question 11

Functions of Muscular Tissue

Answer 11

1. Storage of substances, because we find muscles making up the wall of organs
   - Moving things around
2. Voluntary body movement
3. Maintenance of body posture
4. Muscle contraction produces heat

Question 12

Two types of filaments found in muscles

Answer 12

Actin and Myosin

Question 13

This filament is Thin

Answer 13

Actin

Question 14

This filament is Thick

Answer 14

Myosin

Question 15

How does contraction happen

Answer 15

Myosin pulls on Actin and shortens the filaments, contracting the muscle

Question 16

What are pacemakers

Answer 16

Stimulate contraction for the cardiac muscle

Question 17

Skeletal muscle

Answer 17

• Extremely long
• Multinucleated
• Striated muscle
• Come from fusion of several myoblast
  myoblast= cells born to build muscle

Question 18

What are Sarcomere

Answer 18

Flesh units

• They arrangement of sarcomere in line is called MYOFIBRIL
• Between sarcomere you have a Z line

Question 19

What light can pass through we call it

Answer 19

Isotropic also called I band (light band)

Question 20

When light cannot pass through we call it

Answer 20

Anisotropic also called A band (Dark band)

Question 21

Breakdown

Answer 21

I Band= Contain thick filaments

A Band= Contains both thick and thin filaments

H band= Contains Thick filaments

M line= Middle of sarcomere that anchor the myosin together

Z line= ENDS of a sarcomere that anchors the thin filaments

Question 22

Review notes once mastered this

Answer 22

Review notes