Smooth muscle

Question 1

Smooth muscle characteristics

Answer 1

Widely distributed in the body
Smaller cells than skeletal muscle fibers
Single nucleus 
Spindle-shaped
No striations

Question 2

Dense bodies & Dense areas

Answer 2

where actin myofilaments are attached in smooth muscles.

Equivalent of Z disks

Question 3

Intermediate filaments

Answer 3

Non contractile filaments that attch to the dense bodies

Question 4

Contraction speed

Answer 4

Slower than skeletal muscle,

- Ca2+ diffuses at a slower rate

Question 5

How are smooth muscle contractions stimulated?

Answer 5

Neurally adn hormonally

Question 6

Calmodulin

Answer 6

A protein that Ca2+ binds with

Question 7

Myosin kinase

Answer 7

enzyme activated by Ca bound with calmodulin; transfers a phosphate group from ATP to heads of mysoin molecules to form cross-bridges

Question 8

Myosin phosphatase

Answer 8

The enzyme that causes the relaxation of smooth muscle

Question 9

Types of smooth muscle (2)

Answer 9

Visceral

Multiunit

Question 10

Visceral smooth muscle

Answer 10

More common

Digestive, reproductive, and urinary tracts

Question 11

Multiunit smooth muscle

Answer 11

walls of blood vessels, arrector pili, capsule of spleen

only contracts when stimulated by hormones

Question 12

Duchenne’s muscular dystrophy

Answer 12

Muscles in children atrophy and they are very week

Question 13

Cardiact muscle characteristics

Answer 13

Striated

One nucleus

Question 14

Intercalated disks

Answer 14

specialized cell-to-cell attachments

Question 15

Sarcopenia

Answer 15

Muscle atrophy - age related reduction i muscle mass

Question 16

Other skeletal muscle characteristics that occur in aging

Answer 16

reduced msucle mass
increase time to contract in response to simuli
reduced stamina
increased reovery time

Question 17

FIbromyalgia

Answer 17

chronic, widespread pain in skeletal muscle with no known cure

Question 18

Muscular dystrophy

Answer 18

genetic diorders that cause muscles to degenerate and atrophy

Question 19

TEndinitis

Answer 19

imflammation of tendon due to overuse

Question 20

Fibrosis

Answer 20

scarring of damaged cardiac or skeletal muscle due to deposition of connective tissue

Question 21

Fibrositis

Answer 21

inflammation of fibrous connective tissue, resulting in soreness.