Exam 23: Circulation and Respiration

Scenario Questions Read the following scenario to answer the following questions. Blood flowing away from the heart is under tremendous pressure, able to travel to just about any portion of the body. However, blood pressure drops considerably as it moves away from the heart. When blood finally reaches capillaries, the blood pressure drops to nearly zero. Therefore, when a person is standing, blood returning from the feet is not moved back towards the heart by contractions of the heart. -Blood is propelled back to the heart by ________.

In humans,oxygen is delivered to the cells of the body by ________.

The following figure illustrates ________.

Heart Block is one type of electrical defect in the heart in which the electrical signal from the sinoatrial node to the relay point is delayed.Predict the effect of Heart Block on the cardiac cycle.

Together,inhalation and exhalation are referred to as ________.

White blood cells play a particularly important role in ________.

A heart murmur occurs when there is a defect in ________.

Examine the structure of blood vessels in the following figure.Which one of the following has the structure best suited to chemical exchange between the blood and tissues?

Which one of the following is a characteristic of open circulatory systems but NOT closed circulatory systems?

Gas exchange requires a surface that is both ________.

Read the following scenario to answer the following questions. Yawning is a reflexive action that is often associated with sleepiness. When a person yawns, the mouth opens, and a longer than normal breath of air is inhaled, followed by a longer than normal exhalation. Hypothesizing that yawning has a regulatory mechanism similar to breathing, scientists conducted an experiment on college students to test the effect of ambient carbon dioxide levels on yawning. -Which of the following would be considered support for the hypothesis tested by the scientists?

As a consequence of red blood cells' lack of nuclei and other organelles,they ________.

Scenario Questions Read the following scenario to answer the following questions. Blood flowing away from the heart is under tremendous pressure, able to travel to just about any portion of the body. However, blood pressure drops considerably as it moves away from the heart. When blood finally reaches capillaries, the blood pressure drops to nearly zero. Therefore, when a person is standing, blood returning from the feet is not moved back towards the heart by contractions of the heart. -Because of the changes in blood pressure through the circulatory system,the best way to feel a pulse is by pressing a finger against ________.

Which of these animals has a double circulatory system?

Trace the path of a red blood cell in a circuit that takes it from the capillary bed of the right kidney to the capillary bed of the left kidney.Assume that you are doing this for an animal with a double circulation system.

Earthworms use ________ as their respiratory surface.

Which of these carry(ies)oxygen-poor blood?

Read the following scenario to answer the following questions. Yawning is a reflexive action that is often associated with sleepiness. When a person yawns, the mouth opens, and a longer than normal breath of air is inhaled, followed by a longer than normal exhalation. Hypothesizing that yawning has a regulatory mechanism similar to breathing, scientists conducted an experiment on college students to test the effect of ambient carbon dioxide levels on yawning. -The scientists found that the level of carbon dioxide in the air did not cause college students to yawn more frequently.What other experiment could they conduct to confirm that they should reject the hypothesis that yawning is regulated in the same way as breathing?

Cigarette smoking ________.

Insects breathe using ________.