These cells are responsible for our skin colour.

This region of the digestive system is responsible for most of the absorption of digested nutrients.

This molecule bridges the synaptic cleft between nerves or between nerves and muscles.

A condition whereby too much growth hormone is produced during childhood.

A region where sperm are stored while they grow up to be mature sperm.

This structure underlies the skin with a flexible cushion.

These finger-like projections of the small intestine increase the surface area for increased absorption.

Another technical name for a nerve impulse.

Most hormones operate according to this regulatory system.

These cells, tucked in between the seminiferous tubules of the testes, produce testosterone.

These bones form our backbone in our back.

These microscopic finger-like projections of the small intestine increase absorption exponentially throughout the small intestine.

In the peripheral nervous system, the myelin sheath is formed by these cells.

These two hormones promote lactation.

In the ovary, this structure releases estrogen.

These membranes line our body cavities and lungs.

These two components of food are absorbed by the large intestine.

During this period of the day, memories are apparently sorted out; some are "cleaned out" while some are augmented.

The posterior pituitary gland releases these two hormones.

In this phase of the ovarian cycle, the corpus luteum supports the possible implantation of a zygote in the uterus.

These tissues are comprised of both loose fibrous connective tissue and epithelial tissue which contains goblet cells that secret mucous.

Steve Jobs died in 2011 of this digestive disorder.

This region of the body is rightly considered to be a key component of both nervous and endocrine systems.

These hormones aid in the differentiation and maturation of T cells in the thymus.

This secretion of this hormone by the hypothalamus causes a "domino effect" of release of "sex hormones."