Smooth and cardiac muscle

Question 1

What are some chracteristics of cardiac muscle?

Answer 1

have single mononucleated cells, sarcomeres, gap junctions and are not directly innervated.

Question 2

Are T-tubules more extensive in skeletal muscle or cardiac muscle?

Answer 2

skeletal muscle; they form a diad in cardiac muscle and a triad in skeletal muscle.

Question 3

What are intercalated discs composed of?

Answer 3

desmosomes, fascia adherens and gap junctions.

Question 4

What do the macula adherens do?

Answer 4

link intermediate filaments of cardiac muscle cells.

Question 5

What do fascia adherens do?

Answer 5

anchor actin filament sof sarcomeres.

Question 6

What do gap junctions do?

Answer 6

allow for the passage of molecules between cardiac cell.s

Question 7

In the intercalated discs, what makes up the transverse compnenent?

Answer 7

desmosomes and fascia adherens PIC

Question 8

In the intercalated discs, what makes up the longitudinal component?

Answer 8

gap junctions PIC

Question 9

What are atrial natriuretic peptides?

Answer 9

Proteins secreted by cardiac muscle that regulate electrolytes, relax smooth muscle and are stimulated by atrial stretching.

Question 10

Answer 10

cardiac muscle

Question 11

Answer 11

cardiac muscle

Question 12

Answer 12

cardiac muscle, acute myocardial infarction

Question 13

Answer 13

purkinje fibers

Question 14

What are other names for smooth muscle?

Answer 14

involuntary or visceral muscle.

Question 15

What are some characteristics of smooth muscle tissue?

Answer 15

single cells, no sarcomeres, innervation from the ANS or enteric system, gap junctions, and their conductance is NOT “all or none”.

Question 16

What are two simialrities between cardic muscle and smooth muscle?

Answer 16

single cells and gap junctions

Question 17

What are dense bodies?

Answer 17

They are similar to the Z discs found in skeletal muscle. They anchor atctin filaments to each other and do the cell membrane and assist in contraction forces.

Question 18

What ion are smooth muscle cells dependent upon for contraction?

Answer 18

calcium ions

Question 19

What are caveolin?

Answer 19

Permanent depressions of the cell membrane that are involved in fluid and electrolyte transport. Calveolin binds to the cholesterol In lipid rafts, which creates vesciles (calveolae)

Question 20

What two types of receptors are smooth muscles innervated by?

Answer 20

adrenergic (sympathetic) and nicotinic (parasympathetic); excitation is spread by gap junctions.

Question 21

PIC

Answer 21

smooth muscle

Question 22

PIC

Answer 22

smooth muscle