Claire lost the ability to completely empty her bladder following a stroke, and a nurse inserts a catheter into the open end of her urinary tract each day to remove the urine. Into what structure does the nurse insert the catheter?

The organ that performs filtration of blood, reabsorption, and secretion in vertebrates is the ________.

True or false: The axon of a neuron can only communicate with other neuronal cells.

Which of the following structures is also called the windpipe?

Leukocytes (white blood cells) account for about ________ of the cells in human blood.

The most efficient lungs with respect to oxygen uptake are found in this group of vertebrates.

Connective tissue includes adipose tissue, tendons, bone, cartilage, and blood. What do all these tissues have in common?

The ____________ valve guards the opening between the left atrium and left ventricle.

Why doesn’t the stomach acid just digest right through the wall of the stomach?

Saliva contains the hydrolytic enzyme, salivary amylase, which initiates the breakdown of the polysaccharide ________ into the disaccharide, maltose.