Which chambers pump blood out of a vertebrate’s heart?

• arteries

• atria

• veins

• ventricles

What is the maximum number of chambers in any vertebrate heart?

• three

• four

• five

• six

Mammals have a muscle called a(n) ________ to help them breathe.

• air sac

• diaphragm

• lung

• trachea

The transporting fluid found in an open circulatory system is circulated by body movements.

• True

• False

Larval insects use gills for respiration.

• True

• False

Which support system is a rigid covering that supports an animal from outside its body?

• endoskeleton

• exoskeleton

• hydrostatic skeleton

• jointed skeleton

Which animal uses a muscular siphon to move quickly through the water?

• clam

• octopus

• Portuguese man o’ war

• shark

What are the electrical signals that are used to control an animal’s actions?

• flexors and extensors

• neurons

• nerve impulses

• nerve nets

A grasshopper has tiny openings called ______ along the sides of its body. They lead into a network of tubes called ______ that reach all of the grasshopper’s tissues and are the place where oxygen and carbon dioxide are exchanged.

• Spiracles;

  Tracheae

• Lungs;

  Veins

• Gills;

  Atria

• Air Sacs;

  Arteries

The force required to push an animal upward through water or air is called ____.