Ch 42 Circulatory System (Transport)

The axolotl, an aquatic salamander, carries out gas exchange by . . .

• carrier mediated transport to move oxygen into its lungs.

• simple diffusion of oxygen into its gills.

• active transport to move oxygen into its lungs.

• active transport to move carbon dioxide into its gills.

Circulatory systems have the major benefit of overcoming the short fallings of . . .

• the slow rate at which diffusion occurs across cells.

• communication systems involving the nervous system

• cushionging animals from trauma

• temperature differences between lungs and other active tissues.

The fluid that moves around in the open circulatory system of a typical arthropod like an insect or crustacean is called . . .

• digestive juices

• blood plasma

• interstitial fluid

• hemolymph

To adjust blood pressure independently in the capillaries of the body and provide efficient exchange to support an endothermic life style an organsm would need. . .

• an open circulatory system.

• two chambered heart.

• four chambered heart.

• a hemocoel

A portal system is a (an)

• area connecting arterioles to venules.

• a vessel connecting two capillary beds.

• a series of arteries that return blood to the heart in an open circulatory system.

• a space where blood can pool in an open circulatory system.

Which of the following develops the greatest pressure on the blood in the mammalian aorta?

• systole of the left ventricle

• diastole of the left atrium

• systole of the left atrium

• diastole of the right atrium

Damage to the sinoatrial node (SA node) in humans would . . .

• block conductance between the bundle branches and the hypothalamus.

• contribute to high blood pressure and strokes.

• disrupt the rate and timing of cardic muscle contractions.

• influence the blood pressure in the inferior aorta.

A stroke volume of 70ml/cycle, and a pulse of 72 beats(aka cycles) per minute results in a cardiac output of . . .(watch units here)

• approximately 5 L/min

• 504 ml/min

• 50 L/min

• 500 L/min

The material present in arterioles that is not present in capillaries is. . .

• white blood cells

• plasma

• endothelial cell lining.

• smooth muscle lining that can alter the diameter.

An increase in nitric oxide within a vascular bed is associated with . . .

• vasoconstriction

• vasodilation

• hardening of the arteries

• reduction of blood flow to that area