Skeletal Muscle

Question 0

Functions

Answer 0

• Movement, muscles pull bones to create movement
• Posture, muscles hold bones in position
• Heat production, muscle energy is wasted as heat

Question 1

Charcteristics

Answer 1

• Excitability, receive/respond to stimulus (electrical charge)
• Muscle cells carry an electrical potential
• Contractility, can shorten and return to length

Question 2

Types of muscle

Answer 2

• Smooth, in walls of hollow internal structures
• Cardiac, in heart
• Skeletal, attached to bones

Question 3

Skeletal muscle

Answer 3

• voluntary
• striated
• multinucleate
• rich blood supply

Question 4

Connective tissue

Answer 4

• endomysium, surrounds individual muscle fibers
• perimysium, surrounds bundles of fibers (fasciculi)
• epimysium, surrounds entire muscle
• all membranes are made up of collagen fibers

Question 5

Tendons

Answer 5

• anchors muscle to the bone
• connective membranes bundle together to form tendons
• fibers weave into periosteum of bone

Question 6

Origins/Insertions

Answer 6

• all muscles are attached to at least two bones
• attachment point that moves least is the origin
• attachment point that moves most is the insertion

Question 7

Function (Origin/Insertion)

Answer 7

• movement caused when a muscle contracts is called the function
• nerve that stimulates the muscle to contract is called the innervation

Question 8

Muscle fibers

Answer 8

• fibers are the smallest individual contractile units.

- each fiber is a giant multinucleate cell

Question 9

Fiber arrangement

Answer 9

• Parallel, all fibers run parallel to long axis
• Circular, fibers curve to create an opening
• Radiate, fibers converge from broad origin to a narrow insertion
• Unipennate, fibers attach diagonally to one side of a single tendon
• Bipennate, fibers attach diagonally to two sides of central tendon
• Multipennate, fibers converge in multiple components