Muscle Physiology

Question 1

The ______ nervous system controls skeletal muscles.

Answer 1

Somatic (part of the PNS)

Question 2

Smooth muscles are controlled by the __________ nervous system.

Answer 2

Autonomic (part of the PNS)

Question 3

Skeletal muscles contain _______ _______ cells that are bound by _______ _______.

Answer 3

Muscle fibers, connective tissues

Question 4

A single muscle cells contains many ________ that extend the length of the cell.

Answer 4

Myofibrils

Question 5

Striations are found in…

Answer 5

Cardiac and Skeletal muscles

Question 6

Dark bands in a myofibril:

Answer 6

A bands

Question 7

Light bands in a myofibril:

Answer 7

I bands

Question 8

In the middle of the I bands there are bands called:

Answer 8

Z lines

Question 9

A bands have light areas bisected by bands called:

Answer 9

M lines

Question 10

The functional unit of a myofibril is a:

Answer 10

Sarcomere

Question 11

A sarcomere extends from one ___ ______ to another.

Answer 11

Z line

Question 12

Contraction of a myofibril is caused by a contraction of each:

Answer 12

Sacromere

Question 13

Sarcomeres are comprised of: (2)

Answer 13

Actin and Myosin

Question 14

Thin filament composition:

Answer 14

2 molecules of Actin

Question 15

Thick filament composition:

Answer 15

Hundreds of Myosin molecules

Question 16

Thin filaments are connected to:

Answer 16

one end of a Z line

Question 17

Thick filaments are connected to:

Answer 17

M lines

Question 18

Dark areas of A bands are where ____ and ____ _________ overlap.

Answer 18

thick, thin filaments

Question 19

Light area of A bands are called _______, and consist of _____ filaments only.

Answer 19

H zones, thick

Question 20

The width of the A band corresponds to the ________ of the _____ filaments.

Answer 20

Length, thick