The _________ is a network of membranous channels in the muscle cells that releases calcium ions, causing muscle contractions.

When the distance between the ends of a contracting muscle increases, the isotonic contraction is said to be _____.

The ___________ nervous system regulates the actions of glands, smooth muscles, and the heart.

All of the following are accessory organs of the digestive system except _____.

When the distance between the ends of a contracting muscle increases, the isotonic contraction is said to be _____.

The ___________ nervous system regulates the actions of glands, smooth muscles, and the heart.

The ________ is a pear-shaped, muscular organ consisting of an upper portion, the body, and the neck.

Which of the following is not a layer in the wall of the alimentary canal?

The ________ is a pear-shaped, muscular organ consisting of an upper portion, the body, and the neck.

The small intestine includes all of the following except _____.