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Flashcards in Unit 5 & 6 Deck (54)
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1

Thick central portion of skeletal muscle

Belly

2

Join muscle to tissues as they move

Attachment sites that join muscle to tissue as they move (origin & insertion)

3

Tough fibrous connective tissue bands attaching muscle to bone

Tendon

4

Broad sheets of fibrous connective tissue attaching muscle to muscle or bone

Aponeurosis (ex: linea alba)

5

Prime mover, directly produces desired movement

Agonist

6

Action directly opposing agonist

Antagonist

7

Contracts at same time as agonist, assists action of agonist

Synergist

8

Stabalizes joints to facilitate other movements

Fixator

9

What makes up a skeletal muscle, smallest to largest

Actin & myosin, myofibrils, fascicles, muscle

10

Thick filaments, A bands

Myosin

11

Thin filaments, I bands

Actin

12

Divides sarcomeres

Z lines

13

Contracting unit of skeletal muscle

Sarcomere

14

Connective tissue around individual muscle fibers

Endomysium

15

Connective tissue around fascicles

Perimysium

16

Connective tissue around muscle

Epimysium

17

Describe how a muscle contracts

Nerve impulse travels down the nerve fiber to the presynaptic membrane, which causes acetylcholine to be released from synaptic vesicles into the synaptic cleft. Acetylcholine is then diffused across the synaptic cleft to the post synaptic membrane and binds to receptros on the sarcolemma of the muscle fiber. The impulse travles through the sarcoplasm to the sarcoplasmic reticulum where calcium is released into the sarcoplasm. Calcium diffused into myofibrils, activation the contraction process. Cross bridges from between actin & myosin, causing the muscle fiber to contract.

18

What stops muscle contraction

Acetylcholinesterase

19

Define a motor unit

One nerve fiber and all the muscle fibers it innervates

20

Motor unit that produces small, delicate movements

1 nerve fiber per 5-10 muscle fibers

21

Motor unit that produces large, powerful movements

1 nerve fiber per 100 muscle fibers

22

Attaches cardiac muscle cells together and transmits nerve impulses from cell to cell

Intercalated disks

23

Spindle shaped muscle

Smooth

24

Occurs in large sheets of organs

Visceral smooth muscle

25

T or F, visceral smooth muscle is able to have fine and large movements

F, no fine movemetns

26

Where is visceral smooth muscle found

Walls of hollow internal organs (intestine, bladder, uterus)

27

Individual smooth muscle cells or small groups of cells (no links in between), contractions are localized and discrete

Multi-unit smooth muscle

28

Locations of multi-unit smooth muscle

Iris/ciliary body of eye, walls of small blood vessels, around small airways in lungs

29

Word meaning relating to spinal cord

Myel/myelo

30

Word meaning relating to the brain

Encephal/encephalo