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Flashcards in Muscle part 1 Deck (16)
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1

Bone (osteoblasts) produce a hormone: _____

osteocalcin

2

What are the 7 functions of Muscles?

1. Movement of skeleton
2. Circulation of blood
3. Digestion
4. Respiration
5. Vocalization
6. Focusing of vision
7. Temp regulation

3

What is the "muscle action"

can only pull (contract), NOT push

4

What is the gross structure of Skeletal Muscle?

Tendon - connects muscle to bone
Origin - more stationary and proximal attachment
Insertion - more distal and mobile attachment

5

The entire muscle is covered by _____

epimysium

6

Bundles of muscle fibers are grouped into _____ surrounded by _____.

fascicules
perimysium

7

Individual muscle fibers are surrounded by _____ and connective tissue, _____

sarcolemma
endomysium

8

Muscle cells are called _____ or _____ they are multinucleated

muscle fibers
myofibers

9

What are the types of muscles?

Striated - Cardiac & skeletal
Smooth - repro tissues, digestive tract & vasculature
Voluntary - skeletal
Involuntary - smooth

10

_____ - selective permeability allows differential ion balance between the extracellular fluid and the sarcoplasm

Resting membrane potential

11

Why is the resting membrane potential negative?

-95 mV?

12

What are the 3 types of proteins in myofibers?

1. Contractile proteins (myosin)
2. Regulatory proteins (tropomyosin)
3. Structural proteins (titin)

13

What are the 2 types of myofilaments differing in size and structure?

1. Actin - thin
2. Myosin - thick

14

_____ - center of sarcomere made up of thick filaments (center) and lateral regions made yup of thick and thin myofilaments

A-band

15

Center of the A-band is _____ which is the interconnection of thick myofilaments.

M-line

16

_____ - is the lateral sarcomere region with only thin myofilaments

I-band