Transcription:

Diffusion of nutrients and gases primarily occurs in the __________.

Arteries have a thicker middle layer than veins because they are under lower pressure.

The building blocks of DNA are __________.

Correctly match the following:

Isometric contraction is when muscle tension rises but the muscle does not change length.

Exocrine glands have ducts that discharge secretions.

A cell discharging contents outside the cell is called __________.

Nucleotides are made of a sugar, nitrogen base, and a phosphate.

Tendon and ligament fibers intermingle with the endosteum for attachment of muscle to bone.