Ch 9 Lec 3 - Muscles Flashcards Preview

Anatomy > Ch 9 Lec 3 - Muscles > Flashcards

Flashcards in Ch 9 Lec 3 - Muscles Deck (33):
1

type of lever that is a see-saw with resistance opposite of effort with a central fulcrum

first class

2

example of first class lever

neck extension

3

the effort in neck extension

neckextensors

4

fulcrum of neck extension

atlanto-occipital joint

5

resistance in neck extension

skull

6

type of lever that is a wheel barrow and the effort is opposite of fulcrum to move the resistance

second class

7

example of second class lever

plantar flexion

8

effort of plantar flexion

calf

9

fulcrum of plantar flexion

MP joint

10

resistance of plantar flexion

weight of body

11

type of lever that is a hockey wrist shot where the effort is in between fulcrum and resistance

third class

12

example of a third class lever

elbow flexion

13

effort of elbow flexion

biceps brachii

14

fulcrum of elbow flexion

elbow joint

15

resistance of elbow flexion

weight distal to joint

16

skeletal muscle fiber that has high energy requirements, are anaerobic, have large diamater, and densely packed myofibrils

fast fibers

17

fast fibers have blank mitochondria

few

18

fast fibers have rapid, powerful brief blank

contractions

19

skeletal muscle fibers with more myoglobin, aerobic, and smaller diameter

slow fibers

20

slow fibers take blank to contract

longer

21

slow muscles are blank in color

red

22

fast fibers are blank in color

white

23

skeletal muscle fibers that are slow and fast and have greater resistance to fatigue

intermediate fibers

24

blank can change one muscle type to another

exercise

25

this muscle type is attached to hair follicles in skin

smooth

26

three smooth muscle characteristics

in walls of organs and blood vessels, nonstriated, involuntary, elastic, spindle shaped, slow contractions

27

two things that stimulate smooth muscles

nervous system, hormones, ions, stretching

28

many gap junctions, sheets of spindle-shaped cells, and contract together in this type of smooth muscle

single unit

29

example of single unit smooth muscle

blood vessels, digestive tract, urinary tract, respiratory tract

30

type of smooth muscle that has no or few gap junctions, separate fibers, only contract when stimulated by motor nerve

multi unit

31

example of multi unit smooth muscle

large blood vessels, uterus, iris of ey

32

muscle type that is striated, involuntary and autorhythmic

cardiac muscle

33

cardiac muscle is made of a network of fibers with blank at ends and is found only in blank

intercalated disks, heart