#ThrowbackThursday #BrainCellsInUse

Cells- the smallest structural and functional unit of an organism, typically microscopic and consisting of cytoplasm and a nucleus enclosed in a membrane.

Plant cells- eukaryotic cells that differ in several key aspects from the cells of other eukaryotic organisms.
Animal cells-The membranes of organelles within the cell are made of the same basic material as the cell membrane. In plant cells, the cell membrane is surrounded by a rigid cell wall. Also called plasma membrane.

muscle- a band or bundle of fibrous tissue in a human or animal body that has the ability to contract, producing movement in or maintaining the position of parts of the body.

nerve- (In the body) a whitish fiber or bundle of fibers that transmits impulses of sensation to the brain or spinal cord, and impulses from these to the muscles and organs.

bone- any of the pieces of hard, whitish tissue making up the skeleton in humans and other vertebrates.

valves in the heart control blood flow

digestive system- The organs and glands in the body that are responsible for digestion. The digestive system begins with the mouth and extends through the esophagus, stomach, small intestine, and large intestine, ending with the rectum and anus.

circulatory sysem- the system that circulates blood and lymph through the body, consisting of the heart, blood vessels, blood, lymph, and the lymphatic vessels and glands.

Respiratory system- a system of organs functioning in respiration and in humans consisting especially of the nose, nasal passages, pharynx, larynx, trachea, bronchi, and lungs.

Parameciums are single celled organisms that have some features that are the same as regular, multi cell organisms but they also have different parts like the cilia wjich is how the cell moves.