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Flashcards in Muscle Notes Deck (25):
1

Moves an animal through its environment

Somatic Muscle

2

Moves substances through an animal

Splanchnic muscle

3

What are the three basic types of muscles

Skeletal, Cardiac & Smooth

4

Which two types of muscle are striated

Skeletal & Cardiac

5

Where are some places smooth muscles are found?

Internal organs, blood vessels & glands

6

What is another name for smooth (or non-striated) muscle?

Visceral

7

Define neurogenic and describe the muscle type that fits this bill

Neurogenic - contraction is initiated by nerve impulses. Eg: Skeletal muscle

8

Define myogenic and describe the muscle type that fits this bill

Myogenic - contraction arises due to impulses WITHIN the muscle itself (in the SA node), which then passes to all connected cells. Eg. Cardiac Muscle

9

Which muscle type uses both myogenic (connected via syncytium) and neurogenic control,

Smooth muscle

10

What makes a muscle to appear striated

Myofilaments overlap

11

Skeletal muscle cells are very ____ *describe size* with ___ nuclei

Large
Multiple

12

Skeletal muscles are under ____ control, while smooth and cardiac muscle are under ____ control.

Voluntary, Involuntary

13

What is another name for the gap junctions that connect cardiac muscle cells

Intercalated disks

14

What is the name of the network of cells that cardiac muscle cells form when they are joined by intercalated disks:

A synctytium

15

Which muscle types fatigue and which dont?

Skeletal muscle is fatigable while cardiac and smooth is not

16

Cardiac and Smooth muscle are ____-nucleated

uni

17

Describe the shape of smooth muscle cells

Elongated, spindle-shaped

18

Describe the shape of cardiac cells

Elongated, branching

19

Muscle cells aka

Muscle fibers

20

What are muscle fibers composed of

Myofibrils

21

Myofibrils are made up of repeating units called

Sarcomeres

22

Z-line (aka Z-disk)

From Z-disk to Z-disk is one sarcomere. This is the union of two actin heads.

23

A-band

The entire length of myosin, including where there's actin-myosin overlap

24

I-band

Only actin here. Becomes shorter during contraction

25

H-zone

Only myosin here, becomes shorter during contraction