ch. 9 vocab Flashcards
Adaptations
Structures and behaviors that allow animals to preform their functions.
Homeostasis
Keeping internal body conditions stable.
Verterbrates
Animals with a backbone.
Inverterbrates
Animals without a backbone.
Tissue
A group of similar cells that preforms a certain function.
Organ
A group of tissues.
Radial symmetry
When many imaginary lines can be drawn through a central point to divide it into 2 mirror images.
Bilateral symmetry
If only one line of symmetry can be drawn to divide it into halves that are mirror images.
Cnidarians
Invertebrate that have stinging cells and take food into a central body cavity.
Mollusks
Invertebrates ofte protected by a hard shell.
Arthropods
Invertebrates that have a hard covering.
Exoskeleton
An outer skeleton.
Echinoderm
Invertebrate with an inner skeleton with a system of fluid filled tubes.
Endoskeleton
Internal skeleton.
Chordates
An animal that has a notochord, nerve chord, and throat pouches at some point in their lives.
Notochord
A flexible rod that supports the chordate’s back.
Vertebrae
The small stacked bones in the backbone.
Ectotherm
An animal that produces little internal body heat.
Endotherm
An animal that controls the internal heat it produces and regulates its own temperature.
Fish
A vertebrate that lives in water and uses fins to move.
Cartilage
A tissue more flexible than bone.
Amphibian
A vertebrate that is ectothermic ad spends its early life in water.
Reptile
An ectothermic vertebrate, has scaly skin, and lays eggs on land.
Bird
Is an endothermic vertebrate thats lays eggs, has feathers, and a four-chambered heart.
Mammals
Are endothermic vertebrates have skin covered with fur or hair, and a four-chambered heart.
Mammary glands
The organs that produce milk for the young.
Monotremes
Lay eggs.
Marsupials
Born at an early stage of development.
Placental mammal
Develops inside the mother’s body until its body system ca function independently.
Placenta
Materials are exchanged through this organ.
