Hollow ball that is formed when the zygote undergoes cell divisions.

The outer layer tissue that gives rise to the outer layer of skin, nervous system, and sense organs.

Inter layer of tissue that gives rise to the digestive lining respiratory system and digestive organs.

Middle layer of tissue that gives rise to the skeletal system muscles and the circulatory system.

Describes an animal's shape, symmetry, and internal organization.

Irregular in shape and sometimes their shapes depend on where they are growing.

Body parts arranged around a central axis, somewhat like the spokes around a bicycle wheel.

A body design in which there are distinct right and left halves.

An anterior concentration of sensory structures and nerves.

A fluid-filled space found between the body wall and the digestive tract.

Animals with a body cavity located between the mesoderm and endoderm.

Animals with a body cavity located entirely within the mesoderm.

Shows how animals are related through evolution.

Gastrovascular cavity

A digestive cavity with only one opening and no specialization within.

Uptake of oxygen and release of carbon dioxide.

Extremely thin projections of tissue that are rich in blood vessels, providing a large surface for gas exchange.

Open circulatory system

A heart pumps fluid containing oxygen and nutrients through a series of vessels out into the body cavity.

Closed circulatory system

A heart pumps blood through a system of blood vessels and the blood remains in the vessels.

Consists of water that is contained under pressure in a closed cavity such as a gastrovascular cavity or coelom.

Is a rigid external skeleton that encases the body of an animal.

Is composed of a hard material, such as bone, embedded within an animal.

Organisms that have both testes ovaries.

External fertilization

The egg is fertilized outside the female’s body.

Internal fertilization

Fertilization within a female's body.

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Chapter 28 vocab

Question	Answer
Blastula	Hollow ball that is formed when the zygote undergoes cell divisions.
Ectoderm	The outer layer tissue that gives rise to the outer layer of skin, nervous system, and sense organs.
Endoderm	Inter layer of tissue that gives rise to the digestive lining respiratory system and digestive organs.
Mesoderm	Middle layer of tissue that gives rise to the skeletal system muscles and the circulatory system.
Body plan	Describes an animal's shape, symmetry, and internal organization.
Asymmetrical	Irregular in shape and sometimes their shapes depend on where they are growing.
Radial symmetry	Body parts arranged around a central axis, somewhat like the spokes around a bicycle wheel.
Bilateral symmetry	A body design in which there are distinct right and left halves.
Cephalization	An anterior concentration of sensory structures and nerves.
Coelom	A fluid-filled space found between the body wall and the digestive tract.
Acoelomates	Animals with no body cavity.
Pseudocoelomates	Animals with a body cavity located between the mesoderm and endoderm.
Coelomates	Animals with a body cavity located entirely within the mesoderm.
Phylogenetic tree	Shows how animals are related through evolution.
Gastrovascular cavity	A digestive cavity with only one opening and no specialization within.
Respiration	Uptake of oxygen and release of carbon dioxide.
Gills	Extremely thin projections of tissue that are rich in blood vessels, providing a large surface for gas exchange.
Open circulatory system	A heart pumps fluid containing oxygen and nutrients through a series of vessels out into the body cavity.
Closed circulatory system	A heart pumps blood through a system of blood vessels and the blood remains in the vessels.
Hydrostatic skeleton	Consists of water that is contained under pressure in a closed cavity such as a gastrovascular cavity or coelom.
Exoskeleton	Is a rigid external skeleton that encases the body of an animal.
Endoskeleton	Is composed of a hard material, such as bone, embedded within an animal.
Hermaphrodites	Organisms that have both testes ovaries.
External fertilization	The egg is fertilized outside the female’s body.
Internal fertilization	Fertilization within a female's body.

Created by: ava-barnhill

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