THE CELL

Folds

________ are made in the inner membrane to enhance the surface area available for energy release.

Dendrites

________ are responsible for receiving nerve impulses.

Phospholipid molecules

________ form a double layer that serves as the fundamental structural element of this membrane.

Organelles

________ are the structures that may be found within a cell; each ________ has its own unique size, shape, and function.

sperm

Each ________ has a head that is responsible for transporting the genetic material of the father, and a whip- like tail that is used for movement.

human sperm cell

The ________ has a slender tail, known as a flagellum, that extends from it.

Neurons

(nerve cells) and muscle fiber cells (myofibers) are two examples of highly specialized cells that can grow to be more than 30 centimeters (more than 12 inches) in length. 

Organelles

are the structures that may be found within a cell; each organelle has its own unique size, shape, and function.

interior

The _ of the cell is very well organized, with compartments that are connected to one another by sheets and membranes. 

skeleton

These compartments are held in place by a flexible "_" that is made up of even smaller tubules and filaments.

starter

Stem cells are "_" cells that are not specialized but have the potential to develop into specialized cells. 

Stem cells

in an embryo have the potential to differentiate into any of the body's more than 200 different types of specialized cells

**Epithelial cells**

These cells are responsible for the formation of skin, as well as the covering of most organs and the lining of hollow cavities, such as the digestive tract.

**Photoreceptor cell**

In the retina of the eye is a type of cell that is sensitive to both light and color called a cone cell.

red cell

also known as an erythrocyte, is essentially a sack filled with oxygen-carrying hemoglobin molecules.

Adipocytes

which are the primary kind of adipose cell, are large and packed to the brim with lipid droplets, which are responsible for the storage of energy.

**Smooth muscle cell**

The enormous, spindle-shaped cells that make up smooth muscle contract by sliding strands of protein along the interior of the cell.

**Nerve cell**

Each cell has what are called dendrites, which are short branches, and an axon, which is a long "wire."

**Sperm cell**

Each sperm has a head that is responsible for transporting the genetic material of the father, and a whip-like tail that is used for movement.

**Ovum (egg) cell**

These enormous cells hold the genetic material from the mother as well as the energy supplies necessary for the embryo to begin its first cell divisions.