Unit 4: Notes 2 Flashcards Preview

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Flashcards in Unit 4: Notes 2 Deck (16)
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1

what's in a muscle?

- muscle fibers
- connective tissue
- nerves (motor neurons)
- blood vessels (capillaries)

2

name the connective tissue hierarchy

1. muscle cell or fiber
2. Endomysium
3. Perimysium
4. Epimysium

3

what is the endomysium?

connective tissue around a muscle cell or fiber

4

what is the perimysium?

connective tissue around a bundle of muscle fibers

5

how many muscle fibers is a fascicle made up of

150

6

what is a bundle of muscle fibers

fascicle

7

what is the epimysium

connected tissue around a muscle

8

describe the muscle fiber or cell

1. elongated multinucleated cell/fiber
2. lots of mitochondria
3. contain hundreds to thousands of myofibrils
4. surrounded by sarcolemma
5. contains sarcoplasm

9

what are myofibrils?

contractile units of muscle fiber

10

what is the sarcolemma

The cell membrane

11

what's is sarcoplasm

The cytoplasm of muscle cell

12

what are myofibrils made up of

actin and myosin

13

what is actin

thin filament

14

what is myosin

thick filament

15

what is a sarcomere

A single unit of muscle contraction

16

describe a sarcomere

- overlapping pattern of actin and myosin
- light ("I" bands)
- dark ("A" bands)
- Z lines
- one Z line to another