Muscular System

Question 1

Muscle Tissues consists of fibers to provide:

Answer 1

• motion
• maintain posture
• produce heat

Question 2

Three types of muscle tissue

Answer 2

• Skeletal muscle
• cardiac muscle
• smooth muscle

Question 3

Skeletal Muscle Appearance & Features:

Answer 3

• long cylindrical fibers
• many peripherally located nuclei
• unbranched & striated

Question 4

Skeletal muscle location:

Answer 4

most commonly attached by tendons

Question 5

Skeletal muscle connective tissue components:

Answer 5

• endomysium
• perimysium
• epimysium

Question 6

are skeletal muscle contractile proteins organized into sarcomeres & how much sarcoplasmic reticulum does it have

Answer 6

yes & abundance

Question 7

Cardiac Muscle appearance & features:

Answer 7

• branched cylindrical fiber
• one centrally located nuclei
• intercalated discs join neighboring fibers
• striated

Question 8

Cardiac Muscle Location:

Answer 8

Heart

Question 9

Cardiac Muscle connective tissue components

Answer 9

endomysium & perimysium

Question 10

are Cardiac muscle contractile proteins organized into sarcomeres & amount of sarcoplasmic reticulum?

Answer 10

yes & some

Question 11

Smooth muscle appearance & features

Answer 11

• fiber thickest in middle & tapered at each end
• one centrally located nucleus
• not striated

Question 12

Smooth Muscle location:

Answer 12

walls of hollow viscera, airways, blood vessels, iris, ciliary body of eye, & arrector pili muscles of hair follicles

Question 13

Smooth muscle connective tissue components:

Answer 13

Endomysium

Question 14

Are smooth muscle’s contractile proteins organized into sarcomeres & amount of sarcoplasmic reticulum?

Answer 14

no & very little

Question 15

Skeletal Muscle Role & function:

Answer 15

• conscious control
• acts as pulley system
• accounts for half of body weight
• ~600 in body
• striated: actin & myosin

Question 16

Three layers of connective tissue:

Answer 16

Epymysium
Perimysium
Endomysium

Question 17

Epimysium:

Answer 17

• outermost layer

- surrounds entire muscle

Question 18

Perimysium:

Answer 18

• surrounds groups of muscle fibers called fascicles

Question 19

Endomysium:

Answer 19

• deepest layer

- separates individual muscle fibers

Question 20

Connective tissue layer function

Answer 20

• provides access for nerves and blood vessels. inserts into tendon

Question 21

A Muscle Fiber / Muscle Cell is made up of:

Answer 21

• Sarcolemma = plasma membrane
• sarcoplasm = cytoplasm
• myofibrils = long strands of sarcomeres
• sarcoplasmic reticulum (storage for calsium)

Question 22

Sarcomeres:

Answer 22

• contractile units of muscle

- made up of overlapping myosin (thick) and actin (thin) filaments

Question 23

Myosin:

Answer 23

• thick filaments

- head links thick and thin filaments

Question 24

Actin:

Answer 24

• thin filaments
• composed of actin, troponin, & tropomyosin
• provide anchor point for myosin heads
• either blocks or allows movement of sarcomeres