BIO 100 COGS EXAM 3 Questions And Answers
Homeostasis is the ability of an organism to ____. - ANSWER Maintain a constant internal
environment
Lizards don't maintain their body temperature with internal heat. Rather they bask in the
sun to get warm. - ANSWER This is an example of Ectothermy
In the case of sudden drop in environmental temperature, an endothermic animal will -
ANSWER constrict blood vessels and work to maintain heat within the core of the body.
Which of the following is an example of positive feedback? - ANSWER After you cut your
finger, the injured tissue releases chemicals that stimulate platelets in the blood. These
stimulated platelets release chemicals that stimulate other platelets, and the stimulates
the formation of a blood clot.
Which of the following is most likely to be responsible for lowering your blood sugar
after it rises above normal? ANSWER A homeostasis mechanism based on negative
feedback
The respiratory system ______. ANSWER provides body tissues with oxygen
The order of airflow during inhalation is ______. ANSWER nasal cavity, larynx, trachea,
bronchi, bronchioles, alveoli
During expiration, when the diaphragm is relaxed and volume of the thoracic cavity is
decreased, the air pressure _____ with in the lungs. -ANSWER Increases
What makes it difficult to breathe when you have asthma? -ANSWER- Inflammation
swelling inside the airways
, - Bronchoconstriction muscles tighten around the airway
- Mucus excess mucus clog the airway.
What is the advantage of having grape-like clusters called alveoli as part of the
respiratory system? - ANSWER Alveoli increase surface area allowing for maximized
gas exchange.
A molecule of hemoglobin ______. - ANSWER is made up of four globin proteins, each
bound to a molecule of heme.
Some athletes employ "blood doping," adding more red blood cells to the blood, to give
them an advantage over their competitors. The additional red blood cells will _____. -
ANSWER increase O2 delivery to muscles
All the cellular components of blood are produced by stem cells in the ______. - ANSWER
Bone marrow
Which blood cells protect our bodies from illness? - ANSWER White blood cells
Which blood cells help the blood to clot? - ANS Platelets
Which of the following statements about the circulatory system is not true? - ANS Blood
in the pulmonary vein is deoxygenated
The right ventricle sends blood to _____. - ANS Blood in the pulmonary artery is
deoxygenated
During the systolic phase of the cardiac cycle, the heart is _____. - ANS contracting
How are arteries different from veins? -ANSWER Arteries have thicker wall layers to
accommodate the changes in pressure from the heart.
Homeostasis is the ability of an organism to ____. - ANSWER Maintain a constant internal
environment
Lizards don't maintain their body temperature with internal heat. Rather they bask in the
sun to get warm. - ANSWER This is an example of Ectothermy
In the case of sudden drop in environmental temperature, an endothermic animal will -
ANSWER constrict blood vessels and work to maintain heat within the core of the body.
Which of the following is an example of positive feedback? - ANSWER After you cut your
finger, the injured tissue releases chemicals that stimulate platelets in the blood. These
stimulated platelets release chemicals that stimulate other platelets, and the stimulates
the formation of a blood clot.
Which of the following is most likely to be responsible for lowering your blood sugar
after it rises above normal? ANSWER A homeostasis mechanism based on negative
feedback
The respiratory system ______. ANSWER provides body tissues with oxygen
The order of airflow during inhalation is ______. ANSWER nasal cavity, larynx, trachea,
bronchi, bronchioles, alveoli
During expiration, when the diaphragm is relaxed and volume of the thoracic cavity is
decreased, the air pressure _____ with in the lungs. -ANSWER Increases
What makes it difficult to breathe when you have asthma? -ANSWER- Inflammation
swelling inside the airways
, - Bronchoconstriction muscles tighten around the airway
- Mucus excess mucus clog the airway.
What is the advantage of having grape-like clusters called alveoli as part of the
respiratory system? - ANSWER Alveoli increase surface area allowing for maximized
gas exchange.
A molecule of hemoglobin ______. - ANSWER is made up of four globin proteins, each
bound to a molecule of heme.
Some athletes employ "blood doping," adding more red blood cells to the blood, to give
them an advantage over their competitors. The additional red blood cells will _____. -
ANSWER increase O2 delivery to muscles
All the cellular components of blood are produced by stem cells in the ______. - ANSWER
Bone marrow
Which blood cells protect our bodies from illness? - ANSWER White blood cells
Which blood cells help the blood to clot? - ANS Platelets
Which of the following statements about the circulatory system is not true? - ANS Blood
in the pulmonary vein is deoxygenated
The right ventricle sends blood to _____. - ANS Blood in the pulmonary artery is
deoxygenated
During the systolic phase of the cardiac cycle, the heart is _____. - ANS contracting
How are arteries different from veins? -ANSWER Arteries have thicker wall layers to
accommodate the changes in pressure from the heart.
