Genes are distinct regions of a chromosome.

Endocrine glands are ductless and discharge their secretions into the blood or tissue fluid.

The central nervous system (CNS) is composed of __________.

“Fight or flight” refers to the __________ division of the autonomic nervous system.

Sudoriferous glands have secretions that reduce body temperature.

Match the following terms below.

Fertilization of the egg must occur within 48 hours.

Deciduous teeth are:

The __________ surrounds the __________.

Sudoriferous glands have secretions that reduce body temperature.