digestionThe process of breaking down food by the body.
Definitions:
The process in the alimentary canal by which food is broken up physically, as by the action of the teeth, and chemically, as by the action of enzymes, and converted into a substance suitable for absorption and assimilation into the body.
circulatoryRelated to the circulation of blood or sap.
Definitions:
Of or relating to the circulation of the blood.
cellThe smallest structural unit of an organism.
Definitions:
The smallest structural and functional unit of an organism, typically microscopic and consisting of cytoplasm and a nucleus enclosed in a membrane.
respirationBreathing or exchanging of gases.
Definitions:
The process in living organisms of taking in oxygen from the surroundings and releasing carbon dioxide.
nervousRelated to nerves or the nervous system.
Definitions:
Relating to the nerves or nervous system.
muscleA band of fibrous tissue in a human or animal body that has the ability to contract.
Definitions:
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.