If you were to move from around sea level to a much higher altitude, your body would respond with
develops capillaries, your red blood cell count goes up, lungs get stronger.
The chief advantage of gas exchange in water is that
water can remove 80% of oxygen available instead of 25%
In the countercurrent exchange system of fish gills,
maintains a concentration gradient that favors oxygen diffusion, fluid move counter to eachother, and temperature regulation
Which of the following animals requires the largest and most complex lungs proportional to its overall body size?
birds and mammals
Which of the following options correctly lists the direction of carbon dioxide travel as it leaves the
alveoli-> branchioles-> bronchi-> trachea-> larynx-> pharynx-> nasal cavity
Which of the following is a function of the nasal cavities in humans?
filter, warm, humidify, sanple for odor
Why do cigarette smokers cough more than nonsmokers?
The respiratory systems attempts to clean mucus no longer moved by cilia
When you are breathing normally, exhalation results mainly from
relaxation of rib muscles and the diapragm
Compared to the vital capacity, how much air can lungs actually hold?
more than the vital capacity because there is always a left over portion of oxygen
When you hold your breath, which of the following blood gas changes leads initially to the urge to
increase in CO2 levels of blood and pH drops
What part of the human brain contains the primary breathing control center?
medulla oblangata and pons
Oxygen moves from blood into the interstitial fluid and then to body cells because
it diffuses from a region of higher partial pressure to lower partial pressure
Which of the following statements regarding circulatory systems is true?
it transports oxygen and CO2, distributes nutrients to cells, and conveys waste products of metabolism for disposal
Which of the following is a function of the circulatory system?
Carry oxygen from lungs to tissues and carbon dioxide from tissues to lungs there by aiding in the exchange of gases. Supply of oxygen is needed for proper functioning of the cells. Removal of carbon dioxide is also equally essentials it becomes toxic to cells when present in high amount.
Which of the following animals has a three-chambered heart?
frogs, crocodiles, turtles, lizards, snakes
In mammals, blood returning from the head will pass through the________ just before entering the
superior vena cava
In mammals, which of the following vessels transports oxygenated blood from the lung back to the
The location of the heart's pacemaker is a specialized region of cardiac muscle called the
SA (sinotrial) node
The main function of the AV node is to
relay and contract signals from a pacemaker, and delay the signal 0.1 seconds so the atria have contracted and emitted
Myocardial infarction, also called a heart attack,
is the damage/death of cardia muscle tissue because blood vessels from the heart get clogged
Which of the following is the cause of 40% of all deaths in the United States?
Arteries are distinguished from veins based on the following features
thicker connective tissue, higher blood pressure, and no valves present
Which of the following can contribute to high blood pressure?
cholesterol, genetics, smoking, alcohol, obesity, salt, and a lack of excercise
How long do human red blood cells circulate in the blood before they wear out and have to be