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Anatomy And Physiology > Muscle Tissue > Flashcards

Flashcards in Muscle Tissue Deck (89)
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1

What does skeletal muscle attach to?

bone, skin, or fascia

2

What is Fascia?

Fascia is a fibrous connective tissue that surrounds muscles, groups of muscles, blood vessels, and nerves, binding some structures together, while permitting others to slide smoothly over each other.

3

Are there striations on fascia?

Yes, there are striations on fascia

4

Are skeletal muscle voluntary or involuntary?

voluntary

5

What are some functions of muscle?

Give shape, produce movement, maintain posture, support other structures, generate heat, regulate organ volumes (sphincters)

6

What are some properties of muscle tissue?

excitability
conduction
contraction
extension
elasticity

7

Skeletal muscles are composed of bundles of muscle fibres called what?

Fascicles

8

What are fascicles made up of?

fascicles are made up of MUSCLE CELLS that are elongated and striated (aka MUSCLE FIBRES)

9

What is the membrane called that surrounds the entire muscle?

Epimysium surounds the whole entire muscle

10

What is the membrane that surrounds individual fascicles?

Perimysium surounds individual fascicles

11

What is the perimysium?

Perimysium is a membrane that surounds individual fascicles

12

What is the Epimysium?

Epimysium is the membrane that surounds the whole entire muscle

13

Name the order in which structures of a muscle reside?

MUSCLE made up of
FASCICLES that contain
MUSCLE FIBRES made up of
MYOFIBRILS made up of
SACROMERE made up of
MYOFILAMENTS

14

What are the 3 connective tissue components of muscle tissue

epimysium
perimysium
endomysium

15

Define innervate

to supply with nerves

16

Each muscle is supplied by what (3) things?

artery, vien, & nerve

17

Each muscle fibre is supplied by what (2) things?

(1-2) capillaries & motor neuron

18

How many muscle cells does a motor neuron innervate?

a motor unit
(several muscle cells about 150 that contract together)

19

In the formation of muscle cells during embryotic development what fuses together to create the muscle fibre?

myoblasts

20

What are 2 characteristics of mature muscle cells?

- multinucleated
- cannot divide

21

Some myoblasts remain unfused, what are they called?

satellite cells

22

What are satellite cells?

myoblast cells that maintain their ability to divide; aren't very many

23

What is the sarcoplasm?

The cytoplasm of a muscle cell

24

What is the sarcoplasm composed of?

- mainly myofibrils
- glycogen
- myoglobin (red coloured protein that binds to oxygen; and releases it when it is needed by the mitochondria)

25

What are transverse tubules?

invaginations of sarcolemma, filled with interstitial fluid, that carry muscle action potentials deep into sarcoplasm; the arrangement ensure that is excited the whole muscle fibre

26

Define invaginations.

the action or process of being turned inside out or folded back on itself to form a cavity or pouch.
• a cavity or pouch so formed.

27

What is the sarcoplasmic reticulum?

It's like an endoplasmic reticulum of a regular cell; stores calcium

28

What is an endoplasmic reticulum of a non muscle cell?

a network of membranous tubules within the cytoplasm of a eukaryotic cell, continuous with the nuclear membrane.

29

What is the role of calcium in muscle contraction?

binds to troponin which frees up the binding site on actin so myosin heads can bind

30

What triggers calcium to be released

acetycholine (ACH)