Question 1
The ability to extend a leg is the result of
◦ contraction of ligaments and tendons.
◦ contraction of a muscle.
◦ lengthening of a muscle.
◦ a combination of push and pull by antagonistic muscle pairs.
◦ relaxation of myosin and actin proteins.
Question 2
The basic unit of contraction in a muscle is the
◦ myofibril.
◦ sarcomere.
◦ sliding filament.
◦ contractile vacuole.
◦ Z band.