Quiz 10

Question 1

Why do skeletal muscle fibers have striations?

Answer 1

The pattern the fibers in the cell are arranged creates the striation

Question 2

Describe the fascia of a muscle cell

Question 3

Describe the fascicle of a muscle cell

Answer 3

An individual muscle fiber

Question 4

Describe the epimysium of a muscle cell

Answer 4

Dense irregular tissue that wraps around the muscle which allows it to contract

Question 5

Describe the perimysium of a muscle cell

Answer 5

Middle layer of a connective tissue that separates the fasicles

Question 6

Describe the endomysium of a muscle cell

Answer 6

Thin connective tissue of collagen and reticular fibers. that is incased in each muscle fiber

Question 7

Describe the location and structure of the sarcolemma

Answer 7

The plasma membrane of the muscle fibers wraps around the sarcomere

Question 8

Describe the location and structure of sarcoplasm

Answer 8

The cytoplasm of the sarcomere

Question 9

Describe the location and structure of the sarcoplasm reticulum

Answer 9

Stores, relaeses and retirees calcium ions and is wraps around the entirety of the sarcomere

Question 10

Describe the location and structure of myofilaments

Answer 10

Contains an arrangement of actin and myosin to create the striated appearance

Question 11

Describe the location and structure of myofibrils

Answer 11

Runs in the entire length of the muscle fiber and contracts the muscle fibers

Question 12

Describe the location and structure of transverse tubules

Question 13

Describe the parts of a sarcomere

Answer 13

• z line: separates each sarcomere
• I band: contains only thin filaments
• A band:
• H zone: contains only thick filaments includes thin and thick filaments
• M line: holds thick filaments in place
• Sarcomeres are 2um big

Question 14

Describe the components of a thick filament

Answer 14

Contains a myosin tail and actin head bonding sites that are wrapped around together and are dark and dense

Question 15

Describe the components of a thin filament

Answer 15

Contains troponin, tropomysion and actin strands that makes it lighter and less dense

Question 16

Define “origin” and “insertion” as it pertains to skeletal muscles

Answer 16

• Origin: attachment to the bone that remains stable
• Insertion: attachment to the other side of the bone which will move when the muscle contracts

Question 17

How does the location of insertion and origins affect the movement produced when muscles contract

Answer 17

The muscle will only move on the insertion portion

Question 18

How is it possible for skeletal muscles to participate in different movements?

Answer 18

Dependant on the type of joint the muscle is connected to it will participate in that type of movement

Question 19

How does tension in ligaments, tendons and skeletal muscles limit range of motion when a skeletal muscle contracts

Answer 19

The tension is a limitation on ones flexibility in the motion of the skeletal muscle

Question 20

List and provide examples of the criteria used for naming skeletal muscles

Answer 20

• Shape (deltoid)
• Orientation (rectus femoris)
• Size (gluteus Maximus)
• Anatomical position (latissimus dorsi)
• Number of origins (bicep brachia)
• Origin/insertion on skeleton (sternocleidomastoid)
• Action (adductor longus)