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Science 7 Exam

invertebrate An animal without a backbone
muscle tissue Tissue made of muscle cells that allow animals to move.
nervous tissue Tissue made of nerve cells that enables coordinated movement and response to stimuli.
central nervous system The control center of the body that includes the brain and spinal cord.
peripheral nervous system Consists of nerves that connect all areas of the body to the central nervous system.
nerve impulse A wave of electrical activity transmitted between neurons.
withdrawal reflex An involuntary response to an outside stimulus.
sensory nerves Nerves that receive sensory stimuli
motor nerves Nerves that transmit signals to skeletal muscle
cerebrum The part of the brain that controls voluntary movements
cerebellum The part of the brain that keeps the body in balance.
photoreceptors Light-sensitive cells of the retina that convert light into nerve impulses.
optic nerve A nerve that carries nerve impulses from the eye to the brain.
pupil The hole in the eye through which light enters.
image A picture of an object formed where light rays meet
cone cells Photoreceptors that respond to color.
rod cells Photoreceptors that respond to light intensity.
reproduction The formation of new organisms of the same species.
asexual reproduction A type of reproduction that requires only one parent
sexual reproduction A type of reproduction that involves special cells called sex cells.
sex cells Special cells that contain half the number of chromosomes as body cells.
meiosis Cell division that produces sex cells with half the number of chromosomes.
diploid A double set of chromosomes.
haploid A half set of chromosomes.
fertilization The union of egg and sperm.
zygote A fertilized egg.
embryo An organism in its earliest stage of development.
cell differentiation The process of cell specialization.
testes Produce sprem and testosterone.
hormone A chemical that regulates body functions.
semen A mixture of sperm and fluid that is ejaculated during sexual intercourse.
ovaries Female organs that produce eggs and female hormones.
ovulation  The release of a mature egg from the ovary.
follicle A structure of the ovary where an egg matures.
implantation The process in which an embryo becomes embedded in the lining of the uterus.
umbilical cord Contains arteries and veins that connect the embryo to the placenta.
fetus An embryo that has developed for 8 weeks and has formed the major structures.
uterus The organ where a baby grows and develops.
adaptation A adapted trait that helps an organism survive.
evolution The process of how organisms acquire adaptations over time.
ancestor An organism from which others have descended.
cladogram A tree like diagram that displays evolutionary relationships among living species and their ancestors.
homologous structures Body structures that have a common origin but do not necessarily perform the same function.
vertebrates Animals with a backbone.
ecology Science dealing with living beings and their surroundings.
ecosystem A group of living things and their surroundings.
abiotic Factors of the ecosystem which aren't alive.
biotic The organisms that share the environment.
biome The world's major ecosystems
biosphere The part of the planet that can support life.
communities All the organisms that interact in a certain area.
populations A group of individuals of the same species living in a given area.
species Different kind of organisms found on earth.
habitat A place where an organism lives.
niche The function of an organism in a community.
producer Organisms that make their own food.
consumer organisms that do not produce their own food.
primary consumer Organisms that eat plants.
secondary consumer Organisms that eat plants or other organisms.
tertiary consumers Organisms that eat other organisms.
decomposer Organisms that break down cells.
symbiosis An interaction between two species.
mutualism When both organisms benefit from each other.
commensalism When one organism benifits
paratism One organism that benifits from another's harm.
biodiversity All the species living in an area.
Created by: BubbleKS99