Lecture 27 Flashcards Preview

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Flashcards in Lecture 27 Deck (21):
1

The function of skeletal muscle:

- Posture, movement, heat
- On-demand individual-specific

2

The function of cardiac muscle:

- Pumping bloof
- Continuous
- All at once
- Build pressure

3

At the connection of two myocytes in cardiac muscle you'll find....

- An intercalated disc
- Inside the intercalated disc you'll find z discs

4

How do myocytes in the cardiac muscle connect?

- Gap junction (electrical)
- Desmosome (mechanical)

5

In the right atrium ______ cells are located. The depolarisation wave is initiated in the ______ node and travels to the _____ node.

- Pacemaker
- Sinoatrial (SA) node
- Atrioventricular (AV) node

6

What is the order of depolarisation in the heart?

- Atria
- Septum
- Apex
- Ventricles (via purkinje fibres)
- FURTHER DEPOLARISATION up ^^^
- Fully depolarised, contraction!

7

The smooth muscle cell has no ____ cells which means it's not ____. There are ____ length changes. Single-unit smooth muscle cells also have ____ ____ like cardiac muscle. Which means that action potentials can reach other cells through them.

- Sarcomeres
- Striated
- Large
- Gap junctions

8

Smooth muscle cells can be found in the ____ _____.

- Digestive tract

9

In a multi-unit smooth muscle cell they are ______ innervated by neurons.

- Individually

10

Relaxation of the smooth muscle cells = ______. The opposite of this is ______.

- Vasodilation
- More blood flow
- Decrease resistance
- Vasoconstriction

11

Smooth Muscle: Excitation-Contraction

- Action potential / hormones make Calcium ride
- C2+ binds to calmodulin
- Ca-calmoduo\lin complext activates MLCK
- MLCK activates MLC which activates cross bridge
- Myosin filament regulated

12

Skeletal cells have ...... cells

- Long, cylindrical, multinucleate

13

Cardiac muscle cells have....cells

- Mononucleate
- Branching

14

Smooth muscle tissues has .......cells

- Mononucleate
- Spindle-shaped

15

In skeletal and cardiac muscle, ____ and myosin organised along an _____ therefore stronger _____ along the axis. ____ filament regulated. Needs calcium to bind to ____.

- Actin
- Axon
- Force
- Thin
- Troponin

16

In smooth muscle, actin and _____ arranged in various directions so are ____. ___ filament regulated. ____ needed for calmodulin.

- Myosin
- Weak
- Thick
- Calcium

17

In which types of muscle can action potentials be spread from cell to cell?

- Cardiac
- Smooth (only in single-unit)

18

Which types of muscles do we have control over?

- Skeletal

19

What type of muscle do we not have control over? (Involuntary)

- Cardiac
- Smooth

20

Speed of contraction for muscle types...

- Skeletal (fast)
- Cardiac (slow)
- Smooth muscle (very slow)

21

Important info to remember:

- Why do we need muscle?
- Structure
- Mechanism of contraction
- Energy source for contraction of skeletal muscle
- Twitch and tetanus
- Skeletal muscle fibre types
- Structural/functional differences of all muscle types

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