Cardiac muscle

Question 1

What are cardiac muscles?

Answer 1

striated, sarcomere structures the same

Question 2

How do cardiac muscles differ from skeletal muscle

Answer 2

• Muscle fibers are shorter
• May be branched
• Contraction is involuntary—controlled by ANS

Question 3

Is the cardiac muscle multi or uninucleated?

Answer 3

They have a single nucleus

Question 4

Describe the nucleus in cardiac muscles

Answer 4

• Single nucleus
• electrically linked to one another
• exhibit pacemaker pptentials-autorhthymicity
• Under sympathetic and parasympathetic control as well as hormone control

Question 5

what control is the nucleus of cardiac muscle under?

Answer 5

Under sympathetic, parasympathetic, and hormone control

Question 6

Difference between cardiac and smooth muscle

Answer 6

Gap junctions in intercalated disks serve the specialized functions of cardiac muscle tissue

Question 7

What are some causes of muscle disorders?

Answer 7

Muscle cramps,
Overuse
Disuse leads to atrophy
Inherited disorders
Duchenne muscular dystrophy
Myasthenia gravis (grave muscle weakness

Question 8

Autoimmune disorder targets acetylcholine receptors
Muscle weakness

Answer 8

Myasthenia gravis (grave muscle weakness)- lupus

Question 9

Absence of dystrophin affects all muscle tissue types
Progressive muscle weakness; Average lifespan 17 years

Answer 9

Duchenne muscular dystrophy

Question 10

A condition where there is a decrease in tissue or organ due to disuse

Answer 10

Inherited disorders