The _____________ system is responsible for the breakdown and absorption of foods. It is comprised of organs such as the esophagus, stomach, small intestine, and large intestine. 

The structure that connects a kidney to the urinary bladder is the:

The __________ is a small endocrine organ that secretes the hormone melatonin, which controls the circadian rhythms [sleep-wake cycles] of the body.

The heart is surrounded by a serous membrane called the __________

__________ is the voluntary process of taking food or drink into the body through the mouth.

True/False:  Fetal circulation functions differently than a fully developed circulatory system because the placenta does the breathing work for the developing fetus.

The cranial and spinal cavities collectively make up the _______ cavity of the body.

Which of the following is NOT an “accessory” organ of digestion?

True/False: A cell is a minutely organized mass of protoplasm possessing the attributes of life.

Urine is mostly comprised of  ___________.