MUSCULAR SYSTEM PT 1 (UNFINISHED) Flashcards Preview

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Flashcards in MUSCULAR SYSTEM PT 1 (UNFINISHED) Deck (58)
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1

Define Electrical Excitability of muscle tissue.

Muscle tissue responds to stimuli by PRODUCING APs

2

Define Contractility of muscle tissue.

GENERATE TENSION when stimulated by an AP

3

Define Extensibility of muscle tissue.

STRETCH (LENGTHEN) WTHOUT DAMAGE

4

Define Elasticity of muscle tissue.

RETURN ORIGINAL SHAPE after contraction or stretch

5

List the order of the Hierarchy of Skeletal Organization.

Muscle
Fascicle
Muscle Fibre (Muscle Cell)
Myofibril

6

What are the characteristics fro Skeletal/Striated Muscle?

- Alternating light and dark bands
- Voluntary/conscious control

7

A Muscle is subdivided into?

Bundles of fascicles

8

Describe a Fascicle.

Measured in MM. Made up of many muscle fibres

9

Describe a Muscle Fibre/Muscle Cell.

Cylindrical in shape and filled with Myofibrils

10

What is 'Sarcolemma'?

PLASMA MEMBRANE of muscle cell

11

What are Transverse Tubules (T-tubules)?

Tiny TUNNELS in from the sarcolemma towards the centre of muscle fibre.

12

What is 'Sarcoplasm'?

The cytoplasm of the muscle fibres, containing glycogen

13

Describe a Myoglobin.

A protein binding oxygen that diffuses into muscle fibres and delivers it to the mitochondria.

14

What are Myofibrils?

CONTRACTILE ORGANELLES of the muscle cell

15

What is the function of Cytoskeletal Proteins in Myofibrils?

Holds Myofibrils in place

16

What is Sarcoplasmic Reticulum?

SACS/TUBES surrounding each myofibril storing and releasing CALCIUM into cell

17

Define a Sarcomere.

Functional units of a myofibril (contractions)

18

What is an Actin?

Makes up THIN filaments

19

What is an Myosin?

Makes up THICK filaments

20

What generates force/contractions of a Myofibril?

The overlap and interaction of thick and thin filaments

21

What are Myofilaments?

2 contractile proteins of the Sarcomere: Actin and Myosin

22

Explain the PROCESS of the Neurological Control of muscle tissue.

1. Axons reaches muscle using Axon Terminals
2. Axon Terminals form junction with Sarcolemma
3. Axons release Acetylcholine (ACh) over the synaptic cleft

23

What is a Motor Neuron?

A nerve cell that conducts APs to muscle cells

24

What is a Motor Unit?

The motor neuron and all the skeletal muscle fibres it innervates

25

Precise movements require _______ changes in muscle contraction

Small

26

Imprecise movements require _______ amounts of tension.

Large

27

Muscles that perform ______ movements are made up of small motor units.

Fine

28

Muscles that perform _______ movements are made up of large motor units.

Gross

29

Explain Motor Unit Recruitment.

AP travels down motor neuron to muscle fibres which will generate force in that motor unit

30

What are the 3 types of Skeletal Muscle Fibres?

- Slow Oxidative
- Fast Oxidative-Glycolytic
- Fast Glycolytic