1.2.2 - 1.2.4 - difference between muscles

Question 1

What are the characteristics of a skeletal muscle?

Answer 1

• work with your bones, tendons, and ligaments
• attaches to bone
• voluntary movement
• striated (stripes)

Question 2

What are the characteristics of a cardiac muscle?

Answer 2

• lines the heart’s walls
• don’t control cardiac muscles, your heart tells them to contract
• striated (stripes)
• helps your heart pump blood that travels through your cardiovascular system
• contract at the same time

Question 3

What are the characteristics of a smooth muscle?

Answer 3

• lines the insides of organs ex. stomach, bladder
• work without you having to think
• essential jobs ex. move waste through your intestines and help your lungs expand when you breathe
• more mitochondria to help with fatigue (working all the time without us thinking)

Question 4

What does the origin of a muscle mean?

Answer 4

the attachment of a muscle tendon to a stationary bone (fixed - fixed point in time, origin story

Question 5

What does the insertion of a muscle mean?

Answer 5

the attachment of a muscle tendon to a moveable bone

Question 6

KNOW WHERE DIFFERENT MUSCLES ARE

Answer 6

IN THE BODY

Question 7

BE ABLE TO ANNOTATE THE

Answer 7

STRUCTURE OF A SKELETAL MUSCLE

Question 8

BE ABLE TO ANNOTATE THE

Answer 8

STRUCTURE OF SACROMERE, ACTIN, MYOSIN, Z-LINE

Question 9

What is myosin?

Answer 9

70-80% of total protein
thick filament
uses ATP for muscle contraction
myosin head moves back and forth to perform a muscle contraction

Question 10

What is actin?

Answer 10

20% of myofibrillar protein
thin filament
arranged like a twisted pearl necklace
myosin head attaches to the actin