Muscle- Part 4

Question 1

Which muscle is important in instances, urinary bladder, blood vessels, uterus, and iris?

Answer 1

Smooth muscle

Question 2

What type of innervation is smooth muscle?

Answer 2

Autonomic

Question 3

What does autonomic mean?

Answer 3

Both sympathetic and parasympathetic nervous system releasing neurotransmitters

Question 4

What type of muscle has dense bodies?

Answer 4

Smooth muscle

Question 5

What are points of attachments for actin filaments?

Answer 5

Dense bodies

Question 6

What are absent in smooth muscle?

Answer 6

T-tubules

Question 7

Although smooth muscles do not have T-tubules, they have?

Answer 7

Caveolae

Question 8

What has the function in smooth muscle to:
Increase surface area and propagate action potential to deeper parts of muscle?

Answer 8

Caveolae

Question 9

What cell structure surrounds Caveolae?

Answer 9

Sarcoplasmic reticulum

Question 10

What is not stored inside smooth muscle cells due to poor developed SR?

Answer 10

Ca++

Question 11

What do smooth muscles have instead of motor end plates?

Answer 11

Several varicosities

Question 12

What do the vesicles in smooth muscle contain?

Answer 12

NT: ACh, Norepinephrine

Question 13

What neurotransmitter is important for the parasympathetic nervous system?

Answer 13

ACh

Question 14

What neurotransmitter is important for the sympathetic nervous system?

Answer 14

Norepinephrine

Question 15

What is the type of unit smooth muscle where each muscle fiber is innervated separately and can contract independently?

Answer 15

Multi unit

Question 16

What is the type of unit smooth muscle where no conduction of impulses to neighbor cells?

Answer 16

Multi unit

Question 17

What is the type of unit smooth muscle where it would be found in the iris, cilliary body, arrector pill, large arteries?

Answer 17

Multi unit

Question 18

What is the type of unit smooth muscle where gap junctions between cells?

Answer 18

Single unit

Question 19

What is the type of unit smooth muscle where conduction of impulses to other SM cells?

Answer 19

Single unit

Question 20

What is the type of unit smooth muscle responsible for peristalsis?

Answer 20

Single unit

Question 21

What is the type of unit smooth muscle that can be found in gastro tract, bile ducts, ureters, uterus, and blood vessels?

Answer 21

Single unit

Question 22

For excitation-contraction coupling, what are the 2 types of stimuli?

Answer 22

NT’s
Hormones

Question 23

For excitation-contraction coupling, where does Ca++ come from mainly?

Answer 23

Extracellular fluid

Question 24

For excitation-contraction coupling, what is the protein that Ca++ binds to?

Answer 24

Calmodulin

Question 25

What does Ca++ calmodulin complex activate?

Answer 25

Myosin light chain kinase (MLCK)

Question 26

What does MLCK do?

Answer 26

Phosphorylates myosin

Question 27

What does the MLCK phosphorylation of myosin enable and result in?

Answer 27

The binding to actin —> filament sliding

Question 28

Dense bodies rigid nature makes smooth muscle appear _______ along their borders when contracted

Answer 28

Wrinkled

Question 29

T/F: cardiac muscles cells are electrically connected?

Answer 29

True

Question 30

T/F: excitation-contraction coupling is similar to skeletal muscle

Answer 30

True

Question 31

Since cardiac muscles do not have motor end plates, what do they have?

Answer 31

Varicosities

Question 32

What is the name of the Ca++ binding protein in cardiac muscle

Answer 32

Troponin

Question 33

How big is the sarcoplasmic reticulum in skeletal muscle?

Answer 33

HUGE

Question 34

How big is the sarcoplasmic reticulum in smooth muscle?

Answer 34

tiny

Question 35

How big is the sarcoplasmic reticulum in cardiac muscle?

Answer 35

Normal