Muscles And Bones Flashcards Preview

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Flashcards in Muscles And Bones Deck (15):
1

Bones and muscles homeostasis

- movement in responding to stimuli
-digestion of food
-protection, structure
-b: store/release calcium for muscle contraction, blood clotting, nerve impulse conduction
-m: maintain constant body temp.

2

Tendon

Connective tissue

Origin: attachment of muscle on stationary bone
Insertion: attachment of muscle on bone that moves

3

Action: antagonistic vs synergistic

A: muscles that work in opposite pairs
S: muscles working in groups for common action

4

Fascicles

Muscle fibres arranged in bundles

5

myofibrils

Bundle of myofilaments that run the length of a finer

6

Myofilaments

2 main proteins (actin + myosin) arranged in repeating units

7

Sarcomeres

Repeating units of actin and myosin found along a myofibril

8

Myoblasts

Precursor cells

9

Satellite cells

Mature muscles have these that serve as stem cells for this tissue

10

Myosin

Composes the THICK filaments shaped like a golf club

- motor protein, uses ATP for movement

11

Actin

composes THIN filaments (microfilaments)
- slides over one another during muscle contraction

12

How do you move muscles?
Step 1/3

1: nerve pulses travel down to motor neurons to a NEUROMUSCULAR JUNCTION (NMJ)

13

How do you move your muscles 2/3

neurotransmitter acetylcholine (ACh) released by exocytosis from neurons -> binds to receptors on muscle fibres

14

How do you move your muscles 3/3

Binding stimulates fibres (signal transduction) causing Ca2+ released from sarcoplasmic reticulum

15

Motor unit

Nerve + muscle fibre