A. The type of skeletal muscle
B. Number of sarcomeres involved
C. Number of muscle fiber
D. Size of the muscle

A. Skeletal muscles
B. Smooth muscles
C. Both
D. None

A. Skeletal muscles
B. Smooth muscles
C. Both
D. None

A. Troponin in thin filament
B. Troponin in thick filament
C. Myosin in thick filament
D. Myosin in thin filament

A. Slow
B. Fast
C. Very slow
D. very fast

A. ECF
B. SR
C. ECF and SR
D. troponin

A. Smooth
B. Skeletal
C. Both
D. None

A. Motor neuron
B. Sensory neuron
C. Mixed neuron
D. None

(A) Whales
(B) Seals
(C) Lizard
(D) Salamander

(A) Nephridia
(B) Flame cells
(C) Malpighian cells
(D) Green glands