The synovial joint that allows maximum movements is:

1.	condyloid	2.	gliding
3.	saddle	4.	ball and socket

Even when the blood supply is inadequate, the muscle is able to sustain contraction due to:

Immediately after the motor neuron passes an impulse to a muscle fiber:
1. the impulse travels over the sarcolemma in all directions.
2. calcium is released from the sarcoplasmic reticulum.
3. cross bridge forms between the actin and myosin.
4. troponin undergoes a conformational change.

Identify the incorrect statement:
1. A muscle fiber contracts in an all-or-none fashion.
2. A slight delay occurs between the reaching of impulse at the neuromuscular junction and muscle contraction.
3. Using more motor units will increase the overall force of contraction.
4. When a person is fully at rest, none of her muscles are contracting.

Identify the correct statement regarding the comparison of skeletal and smooth muscle:
1. Nervous stimulation of smooth muscle is always excitatory, whereas nervous stimulation of skeletal muscle may be excitatory or inhibitory.
2. The contractile activity of smooth muscle may be affected by hormones, whereas the contractile activity of the skeletal muscle is not.
3. Both ANS and somatic neural systems innervate smooth muscle, whereas skeletal muscle may be innervated by the somatic motor system only.
4. The calcium-binding protein in smooth muscle is troponin whereas in skeletal muscle, it is tropomyosin.

The critical event for the contraction of striated muscles would be that calcium ions:

Identify the correct statement regarding the use of ATP in muscle contraction:
1. ATP cannot be directly used for muscle contraction.
2. ATP is not required for muscle relaxation.
3. When ATP is hydrolyzed, the conformation of myosin is changed.
4. Once the cross-bridge is formed, the hydrolysis of ATP initiates the power stroke.

Identify the correct statement regarding human ribs:
1. The true ribs attach directly to the sternum with costal cartilage.
2. Floating ribs do not have any attachments.
3. The human ribs are tricephalic.
4. Vertebrochondral ribs are classified as true ribs.

Name the ion responsible for the unmasking of active sites for myosin for cross-bridge activity during muscle contraction.

The globular head of the myosin filament has active site/s for binding to:
I. ATP
II. Active site on actin filament
III. Calcium