When you exhale, you
A waste product of respiration is
When you hold your breath, which of the following blood gas changes...
Aerobic respiration consumes ___ gas and generates ___ gas as a...
In the pulmonary circulation, ___ is expelled from the blood...
Olfaction is
The movement of air across the vocal cords in the ___ produces...
Where would fish have the highest concentration of oxygen in their...
What drives the movement of oxygen from the alveoli into the...
Which of the following types of cells does HIV preferentially infect?
How does an insect "hold its breath"?
In Cystic Fibrosis, a thick dry mucus builds up in the alveoli. Which...
Which of the following options correctly lists the direction of carbon...
Which blood vessels have the thinnest walls?
In the systemic circulation, ___ is expelled from the blood...
Animals that effectively use their body surface for gas exchange must
What name is given to the sheet of muscle that helps move air in and...
In mammals, blood returning from the head will pass through...
The simplest animals with a closed circulatory system are
Which of the following factors contributes to the flow of blood in...
What type of blood vessel is solely responsible for exchange between...
Which of the following cell types is responsible for cell-mediated...
In aquatic organisms, highly folded structures that exchange gases...
Which of the following is an immediate effect of histamine release?
If you were to move from around sea level to a much higher altitude,...
Which of the following is a function of the circulatory system?
Ice fish would have which of the following circulatory systems?
In birds, deoxygenated air moves from the lungs into the ___ before...
The two largest veins of the body that deliver blood to the right...
The main function of the AV node is to
Which of the following organisms has a respiratory system that does...
What drives the movement of carbon dioxide from tissue into the...
The upper respiratory tract is composed of what?
Medullary breathing centers directly sense and respond to
In mammals, which of the following vessels transports oxygenated blood...
The location of the heart's pacemaker is a specialized region of...
The "master cells" of the immune system that initiate and coordinate...
Which of the following wander through the interstitial fluid eating...
The chamber of the mammalian heart that is the most powerful is the
From the left ventricle, oxygen-rich blood flows through the
The lower respiratory tract is composed of what?
The walls of the bronchioles are made up of
Which of the following is a likely advantage of a three-chambered...
HIV has a high mutation rate and can use this to its advantage to...
Which main tissue type of the circulatory system enables diffusion...
How do ice fish transport oxygen in their blood?
The two main functions of the lymphatic system are
The innate chemical substance that alerts other cells and components...
High-flying birds are able to obtain enough oxygen even when the air...
Blood is pumped from the heart to the lungs by the
In arthropods, thee extensively branched internal tubules that connect...
Which of the following animals can obtain the oxygen they need by...
Oxygen-poor blood is carried from the heart of a mammal to the lungs...
In which of the following human blood vessels is the blood pressure...
During ventricular systole, the ___valves ___
A substance that can elicit an immune response is called
Sleep apnea is more common in people who are overweight. Excess fat in...
The ___ is a passageway shared by both food and air
Which of the following animals has a single circuit of blood flow and...
During which phase of the heartbeat does the heart fill with blood?
Natural killer cells
Blood proteins are involved in all of the following activities except
The major result of the inflammatory response is to
The basic function of activated T cells is to identify
Why are gills only found in aquatic animals?
Most CO2 is transported to the lungs
The most important signal that the brain uses to set the breathing...
Which of the following is characteristic of the circulatory system of...
Which of the following function primarily as phagocytes
Which chamber of the heart becomes enlarged in a person with...
Carbon Dioxide sensors are found in
The substance that when activated triggers a chain reaction that...
The innate chemical defense substance that activates T cells and...
Which main tissue type of the circulatory system regulates airflow to...
Which of the following is not a main function of the respiratory...