Muscles

Question 1

Cardiac Muscle - Appearance, Distribution and nervous control.

Answer 1

Appearance - Striated (banded), they Branch, They have intercalated discs that run across the myofibrils (important in synchronising electrical conduction and contraction in heart muscle) and they are Uninucleate.

Distribution - Found only in the wall of the heart.

Nervous control - Myogenic and involuntary control.

Question 2

Smooth muscle - Appearance, Distribution and nervous control.

Answer 2

Appearance - Elongated spindle shaped cells, Not striated, Single central nucleus in each, Discrete cells

Distribution - Present in the iris and ciliary body of the eye, and in the walls of tubular organs

Nervous control - Involuntary

Question 3

Skeletal muscle - Appearance, Distribution and nervous control.

Answer 3

Appearance - Striated and MULTInucleate

Distribution - Attached by tendons to bones

Nervous control - Voluntary

Skeletal muscle contains the Sarcomere, I band, H zone, A band, Z line, M line, Myosin and Actin filaments etc
Different to cardiac muscle as they are multinucleate whereas cardiac muscle is uninucleate.