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Flashcards in Muscular System Deck (69)
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Types of Muscle

Smooth Muscle
Cardiac Muscle
Skeletal Muscle

1

Smooth Muscle

Narrow cylindrical fibers, non-striated, uninucleate; occurs in walls of internal organs; is involuntary;

2

Cardiac Muscle

Has striated, branched, generally uninucleated fibers; occurs in walls of heart; is involuntary;

3

Skeletal Muscle

Has striated, tubular, multinucleated fibers; is usually attached to skeleton; is voluntary.

4

Functions of the Muscular System

Support the body
Allow for movement of bones and other structures
Help maintain constant body temperature
Assist in movement of fluids in cardiovascular and lymphatic vessels
Protect

5

Bursa

Fluid filled sacs that provide cushioning between tendons and bones

6

Tendon

The connective tissue that connects muscle to bone

7

Origin

Attachment of a muscle to a stationary bone

8

Insertion

Attachment of a muscle on a bone that moves

9

Prime Mover

Does most of the work when moving

10

Synergist

Assists the prime mover

11

Antagonist

Works against the prime mover - purpose is to undo what was done by the prime mover

12

Muscles are named based on what seven characteristics?

Size
Shape
Location
Direction of fibers
Attachment
Number of attachments
Action

13

Do muscles pull or push?

Pull

14

T-tubule (transverse)

Portion of sarcolemma that penetrates muscle cells.

15

Sarcoplasmic Reticulum

Smooth endoplasmic reticulum that stores Ca+

16

Sarcolemma

Plasma membrane

17

Sarcoplasm

Cytoplasm

18

Sarcomere

One contracting unit of the muscle cell; made of the proteins actin and myosin

19

Actin

thin filaments

20

Myosin

Thick filaments shaped like a golf club

21

I Band

Region on a sarcomere where actin but no myosin is

22

H zone

Region where myosin is but no actin

23

A band

Length of the myosin fiber

24

How do filaments go over one another during muscle contraction?

Filaments slide over one another - do NOT crunch up!

25

First step of ATP in cellular work of motion...

ATP is split when myosin head is unattached (so becomes ADP)

26

Second step of ATP in cellular work of motion

ADP + P are bound to myosin as myosin head attaches to actin

27

Third step of ATP in cellular work of motion

Upon ADP+P release, power stroke occurs; head bends and pulls actin

28

Fourth step of ATP in cellular work of motion

Binding of fresh ATP causes myosin head to return to resting position

29

Power Stroke

Movement of myosin head to pull actin