CORRECT ANSWERS GRADED A+
◍ How does a sagittal section divide the body?
A. Into right and left regions
B. Into upper and lower regions
C. Into front and back regions
D. Between the dorsal and ventral cavities.
Answer: A. A sagittal section occurs along a longitudinal plane, dividing the
body into right and left regions.
◍ The vena cavae drain blood from the body into the _______.
A. right atrium.
B. right ventricle.
C. left atrium.
D. left ventricle..
Answer: A. Deoxygenated blood first enters the heart via the right atrium.
◍ In which part of the lungs do nearly all the gaseous exchanges between air
and blood take place?
A. Pleura.
B. Trachea.
C. Bronchioles.
D. Alveoli..
Answer: D. The alveoli are the tiny air sacs in the lungs where the exchange
of oxygen and carbon dioxide takes place.
◍ What is the normal pH of human arterial blood?
A. 6.8
B. 7.4
C. 7.9
, D. 8.2.
Answer: B. The range is about 7.35 to 7.45, making blood fairly neutral.
Excess carbon dioxide can lead to acidosis, a pH below 7.35.
◍ Which organ system is primarily responsible for integrating voluntary
movements?
A. Cardiovascular system.
B. Digestive system.
C. Respiratory system.
D. Nervous system..
Answer: D. The nervous system controls the voluntary movements of the
skeletal system.
◍ Why might certain young people be underweight?
A. They are growing in height faster than they are gaining weight.
B. They eat little protein and too much fat and suger.
C. They eat several meals a day and fail to exercise enough.
D. They seldom eat a meal that contains foods from all food groups..
Answer: A. This is a common cause of underweight in adolescents. Choices
B and C would be more likely to lead to overweigh.
◍ When the pulmonary valve and aortic valves are open, where can blood
flow?
A. Between the two ventricles of the heart.
B. From atrium to ventricle within the heart.
C. Between the heart and the rest of the body.
D. Between the atria in the heart..
Answer: C. The two valves connect the heart to the pulmonary artery and
the aorta, which carry blood from the heart to the rest of the body.
◍ Of the following processes, which one is a different level of defense from
the others?
A. A low pH in the stomach
B. Cilia present in the trachea
C. Body cells recognizing a pathogen
, D. Mucus present in the nasal cavity.
Answer: C. A low pH in the stomach (choice A), cilia in the trachea (choice
B), and mucus (D) are primary defenses. Cells recognizing a pathogen
(choice C) is a third line of defense.
◍ Which of the following are tropic hormones? (select all that apply.)
A. Somatotropin.
B. Follicle-stimulating hormone.
C. Antidiuretic hormone.
D. Thyroid-stimulating hormone..
Answer: A, B, D.
◍ Which part of the nervous system includes the femoral , radial, and ulnar
nerves?
A. Somatic
B. Autonomic
C. Sympathetic
D. Parasympathetic.
Answer: A. The symphathetic and parasympathetic systems (choice C and
D) are part of the autonomic nervous system (choice B), which controls
involuntary actions of the smooth muscles, glands, and heart. The somatic
nervous system (choice A) has to do with reception of external stimuli and
voluntary control of the muscles.
◍ What is the name of the bone in the human thigh?
A. Ulna
B. Femur
C. Radius
D. Humerus.
Answer: B. The ulna (choice A), radius (choice C), and humerus (choice D)
are arm bones.
◍ Which minaral helps to maintain fluid balance in the body?
A. Potassium.
B. Cobalt.