BIOL-1240 Circulatory System Ch 40

Diffusion is an effective transport mechanism in all of the following except:

• sponges

• cnidarians: hydra

• annelids

• platyhelminthes - flatworms

A closed circulatory system usually consists of all of the following except:

• blood

• pumping organ

• arteries

• veins

• hemocoel

Why doesn't a flatworm have a circulatory system?

• The animal is thin enough to permit effective gas exchange by diffusion

• There is not enough room for a circulatory system because of the large gastrovascular cavity.

• The animal lacks muscles, so it could not have a heart to pump blood.

• Only bilaterally symmetrical animals need a circulatory system.

• Only vertebrates have circulatory systems.

Which of the following statements is false?

• The tissues of arthropods are bathed with hemolymph, which delivers oxygen to their cells.

• In an open circulatory system the heart is still responsible for pumping oxygen-rich fluid.

• Earthworms have a central heart that pumps blood to all their tissues.

• Blood vessels are found in the open circulatory systems common to some invertebrates.

• Open circulatory systems can be found in both vertebrates and invertebrates.

The type of system depicted in the accompanying figure is:

• an open circulatory system

• a vertebrate circulatory system

• a closed circulatory system

• a lymph system

• an open digestive systen

The vertebrate circulatory system performs all of the following functions except:

• transporting nutrients to and from storage areas

• neutralizing the acidity of blood

• transporting hormones to target tissues

• helping regulate fluid balance

• defending against microorganisms

The vertebrate circulatory system consists of all of the following except:

• a muscular heart

• blood vessels

• lymph vessels

• a hemocoel

• blood

Which of the following is not a component of plasma?

• ertythrocytes

• waste products

• dissolved gases

• salts

• proteins

The rapid onset of overproduction s immature white blood cells is known as

• anemia

• hemolytic anemia

• leukemia

• erythropoietin

Thrombocytes (platelets) are formed by:

• cell division in the spleen

• disruption of a phagocyte

• fragmentation of the cytoplasm of a B lymphocyte

• tiny

  fragments of cytoplasm pinched off from

  large cells in the bone marrow

• the release of granules froma neutrophil

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NGSS.HS-LS1-4