7th Science - Ch. 7 "human Body Systems"

Terms in this set (20)

Calorie
unit of measurement of the amount of energy in food
detect
to discover the presence of
homeostasis
steady internal conditions when external conditions change
immunity
protection from infection or toxins
lymphocyte
type of white blood cell that is made in the thymus, the spleen, and bone marrow
nutrient
part of food that is used by the body to grow and survive
organ system
group of organs that work together and perform a
specific task
protein
long chain of amino acid molecules
vessel
tube in the body that carries fluid such as blood
compact bone
hard outer layer of bone
hormone
chemical signal that is released by the organs of the endocrine system
neuron
basic unit of the nervous system; nerve cell
reflex
Automatic movement in response to a signal
spongy bone
interior region of bone that contains many tiny holes
fertilization
joining of an egg and sperm
gamete
Human reproductive cells
ovum
female gamete
reproduction
the process by which new organisms are produced
sperm
male gamete
zygote
cell that forms when an egg and a sperm join together
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