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science 7/8 vocab final review

vocan no. 9 through 12
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ectotherm
am animal who cannot control their internal body temperature and has to rely on their surroundings for heat
Endotherm
an animal who can produce and regulate its own body heat and internal temperature
swim bladder
a gas filled sac inside fish that helps to stabalize them at different depths
atrai/atrium
the upper chambers of the heart
ventricle
the lower chambers of the heart
placenta
an organ that holds the developing fetus and passes materials between it and the mother
mammary glands
glands that produce milk to feed their young
gestation period
the period while the fetus is developing in the mother, a.k.a. pregnancy
diaphragm
the large muscle below the lungs that helps pull air into and push air out of the lungs
chordate
an animal in the phylum chordata that has a notochord, or spinal chord
radula
teeth that mollusks use to scrape food off of surfaces
exoskeleton
a hard outer shell protecting the soft innards of an invertabrate
molting
the shedding of an exoskeleton so they soft body of the invertabrate can grow and expand
metamorphisis
a process when the animals body undergoes dramatic changes during its lifestyle
antennae
an appendage on the head of some animals that contain sense organs
pupa
the second stage of complete metamorphisis when the insect is enclosed by a covering as it transforms from a larva to an adult
nymph
the second stage of gradula metamorphisis in which the organism is a smaller version that resembles the adult
thorax
the middle section of an insect that contains all of the appendages
abdomen
the last segment of an insect that contains most of the internal organs
water vascular system
a system of fluid filled tubes that are inside the body of an ecniderm.....also helps it the echniderm move
endoskeleton
an internal skeleton
organ
a collection of tissues that carry out a specialized function in the body
vertabrate
an animal with a backbone
invertabrate
an animal that does not have a backbone
assymetry
something that is not symmetrical or does not have any lines of symmetry
radial symmetry
the quality of having many lines of symmetry all passing through a central point
bilateral symmetry
body plan in which only a single, imaginary line can divide the body into two equal halves; characteristic of worms, arthropods, and chordates
cnidarian
radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures
polyp
the cnidarian body plan with a vase shape and is usually adapted for life on an underwater surface
medusa
a cnidarian body plan of a bowl made for a free swimming life
regeneration
the abillity to regrow body parts
xylem
vascular tissue that transports water and nutrients from the roots to other cells
phloem
vascular tissue that transports food from the leaves to other cells
germination
the early growth stage of the embryo when it becomes active and begins to grow roots and leaves
cotyledon
seed leaves used to store food
embryo
the part of a seed that is a zygote with the potential to become a new organism
tropism
the frowth response of a plant toward or away from a stimulus
pollination
transfer of pollen from the anther to the stigma of a plant
transpiration
the emission of water vapor from the leaves of plants
gymnosperm
a plant that produces seeds that are not enclosed by a protective covering
angiosperm
flowering plant; bears its seeds within a layer of tissue that protects the seed