Cardiac and Smooth Muscle Flashcards Preview

BIOL 223 > Cardiac and Smooth Muscle > Flashcards

Flashcards in Cardiac and Smooth Muscle Deck (23):
1

In comparison to muscle cells dependent on anaerobic metabolism, cells using primarily aerobic metabolism would have

More mitochondria
More myoglobin
More cappillaries
More oxidative enzyme

2

Smooth muscles in integument system

Blood vessels, arrector pili muscles

3

Smooth muscles in cardiovascular system

Encircle blood vessels control distribution of blood, help regulate blood pressure

4

Smooth muscles in respiratory system

Contraction or relaxation alters diameters of respiration passageways

5

smooth muscle in digestive system

Control movement of materials through digestive tract

6

Smooth muscle in urinary system

Urinary bladder, ureters, kidney blood vessels

7

Smooth muscle in reproductive tract

Uterus

8

Rank the muscle tissue types in order of size

Skeletal
cardiac
smooth

9

What are desmosomes?

Provide structural attachment

10

What are gap junctions

Hold cells together with membrane channel proteins and allow bioelectrical current to flow from one cell to the next

11

Desmosomes and gap junctions are characteristics of

Cardiac muscle

12

What are intercalated disk?

Cell to cell attachment within cardiac muscle

13

How are smooth muscle myofilaments organized?

Thick filaments scattered throughout sarcoplasm
Thin filaments attached to dense bodies
Sliding of thick and thin filaments causes cell to shorten and twist

14

Define plasticity

Stretched muscle adapts to new length and retains ability to contract and produce tension

15

True or false contractions in smooth muscle can never be as powerful as those of skeletal muscles

False

16

True or false smooth muscle can undergo sustained tetanic contractions

True

17

What type of skeletal contractions produce greatest tension?

Tetanic

18

Cardiac muscle produces what types of contractions only

twitch

19

Smooth muscle contractions produce the greatest tension

tetanic

20

Skeletal muscles are controlled

voluntarily
via motor neurons

21

Cardiac muscles are controlled

involuntarily
controlled by pacemaker cells

22

Smooth muscle is controlled

involuntarily
controlled by pacesetter cells

23

Define automaticity

can contract without neural stimulation