Circulatory Systems

Blood pressure is greatest in the

• veins

• arteris

• arterioles

• venules

• capillaries

All animals have circulatory systems.

• True

• False

Capillaries are the site of gas and nutrient exchange therefore it is important that
they are

• impermeable to everything but H2O.

• permeable to O2, CO2, glucose, Na+ and Cl-

• permeable to glucose and H2O.

• impermeable to O2 and CO2.

Which of the following regarding circulatory systems in fishes is not true?

• Fishes have four chambered hearts.

• Fishes have a systemic (body) and a pulmonary circuit in their circulation.

• Fishes have a closed circulatory system.

• The chambers in a fishes heart are sinus venosus, atrium, ventricle and bulbous arteriosus.

Cardiac muscle is unique because

• cells are connected by synapses and muscle cells generate action potentials.

• cells are connected by gap junctions and muscle cells generate action potentials.

• cells are connected by synapses and neurons generate action potentials.

• cells are connected by gap junctions and neurons generate action potentials.

In an ECG, the T wave corresponds to:

• repolarization of the atria.

• depolarization of the ventricles.

• depolarization of the atria.

• repolarization of the ventricles.

• repolarization of the atria and ventricles.

All the following taxa have four-chambered hearts except for

• fishes.

• Non-crocodilian reptiles (excluding birds).

• birds

• humans and other mammals.

Vertebrate blood is composed of

• plasma and red blood cells

• plasma, and cellular elements that include, red blood cells, leucocytes and platelets.

• red blood cells, leukocytes and platelets.

• hemolymph, and cellular elements that include, red blood cells, leukocytes and platelets

Identify the main pacemaker of the mammalian heart.

• AV node

• AV valves

• SA nodes

• SA valve

• Purkinje Fibers

The proper order of blood flow through the heart in a mammal is

• from the vena cava to right atrium to right ventricle to lungs.

• from vena cava to left atrium to left ventricle to lungs.
  

• from the aorta to left atrium to left ventricle to lungs.

• from vena cava to left atrium to left ventricle to systemic circuit.

• from vena cava to right atrium to right ventricle to systemic circuit.