Which muscle is contracting, and how is it contracting when gravity is the force producing the motion?
a) Eccentric contraction of the biceps brachii; It is lengthening
b) Concentric contraction of the quadriceps femoris; It is shortening
c) Isometric contraction of the triceps brachii; It is maintaining length
d) Eccentric contraction of the gastrocnemius; It is lengthening
e) Concentric contraction of the deltoid; It is shortening