Question : Infants are most susceptible to significant losses in total body water
because of an infant’s:
Student High body surface–to–body size ratio
Answer:
Slow metabolic rate
Kidneys are not mature enough to counter fluid losses
Inability to communicate adequately when he or she is thirsty
Instructor Renal mechanisms that regulate fluid and electrolyte conservation are often not
Explanation: mature enough to counter the losses; consequently, dehydration may rapidly
develop. Infants can be susceptible to changes in total body water because of their
high metabolic rate and the turnover of body fluids caused by their greater body
surface area in proportion to their total body size. The inability to communicate
their thirst is a problem only when they are poorly cared for.
Points Received: 0 of 2
Comments:
Question 2. Question :
Which hepatitis virus is known to be sexually transmitted?
Student A
Answer:
B
C
D
Instructor Only hepatitis B virus (HBV) is known to be sexually transmitted.
Explanation:
Points Received: 2 of 2
Comments:
Question 3. Question :
A person with type O blood is considered to be the universal blood
donor because type O blood contains which of the following?
, Student No antigens
Answer:
No antibodies
Both A and B antigens
Both A and B antibodies
Instructor Because individuals with type O blood lack both types of antigens, they are
Explanation: considered universal donors, meaning that anyone can accept their red blood cells.
Type O individuals, who have neither A or B antigen but have both anti-A and anti-B
antibodies, cannot accept blood from any of the other three types.
Points Received: 0 of 2
Comments:
Question 4. Question :
During an IgE-mediated hypersensitivity reaction, which leukocyte is
activated?
Student Neutrophils
Answer:
Monocytes
Eosinophils
T lymphocytes
Instructor Of the options provided, only eosinophils are activated during IgE-mediated
Explanation: hypersensitivity reactions.
Points Received: 2 of 2
Comments:
Question 5. Question :
What is the life span of an erythrocyte (in days)?
Student 20 to 30
Answer:
60 to 90
, 100 to 120
200 to 240
Instructor Because it cannot undergo mitotic division, the erythrocyte has a limited life span of
Explanation: approximately 120 days.
Points Received: 2 of 2
Comments:
Question 6. Question :
What part of the kidney controls renal blood flow, glomerular
filtration, and renin secretion?
Student Macula densa
Answer:
Visceral epithelium
Juxtaglomerular apparatus (JGA)
Filtration slits
Instructor Control of renal blood flow, glomerular filtration, and renin secretion occur at the
Explanation: JGA. Together, the juxtaglomerular cells and macula densa cells form the JGA. The
control of renal blood flow, glomerular filtration, and renin secretion is not directed
by any of the other options.
Points Received: 0 of 2
Comments:
Question 7. Question :
Which congenital heart defects occur in trisomy 13, trisomy 18, and
Down syndrome?
Student Coarctation of the aorta (COA) and pulmonary stenosis (PS)
Answer:
Tetralogy of Fallot and persistent truncus arteriosus
Atrial septal defect (ASD) and dextrocardia
Ventricular septal defect (VSD) and patent ductus arteriosus
because of an infant’s:
Student High body surface–to–body size ratio
Answer:
Slow metabolic rate
Kidneys are not mature enough to counter fluid losses
Inability to communicate adequately when he or she is thirsty
Instructor Renal mechanisms that regulate fluid and electrolyte conservation are often not
Explanation: mature enough to counter the losses; consequently, dehydration may rapidly
develop. Infants can be susceptible to changes in total body water because of their
high metabolic rate and the turnover of body fluids caused by their greater body
surface area in proportion to their total body size. The inability to communicate
their thirst is a problem only when they are poorly cared for.
Points Received: 0 of 2
Comments:
Question 2. Question :
Which hepatitis virus is known to be sexually transmitted?
Student A
Answer:
B
C
D
Instructor Only hepatitis B virus (HBV) is known to be sexually transmitted.
Explanation:
Points Received: 2 of 2
Comments:
Question 3. Question :
A person with type O blood is considered to be the universal blood
donor because type O blood contains which of the following?
, Student No antigens
Answer:
No antibodies
Both A and B antigens
Both A and B antibodies
Instructor Because individuals with type O blood lack both types of antigens, they are
Explanation: considered universal donors, meaning that anyone can accept their red blood cells.
Type O individuals, who have neither A or B antigen but have both anti-A and anti-B
antibodies, cannot accept blood from any of the other three types.
Points Received: 0 of 2
Comments:
Question 4. Question :
During an IgE-mediated hypersensitivity reaction, which leukocyte is
activated?
Student Neutrophils
Answer:
Monocytes
Eosinophils
T lymphocytes
Instructor Of the options provided, only eosinophils are activated during IgE-mediated
Explanation: hypersensitivity reactions.
Points Received: 2 of 2
Comments:
Question 5. Question :
What is the life span of an erythrocyte (in days)?
Student 20 to 30
Answer:
60 to 90
, 100 to 120
200 to 240
Instructor Because it cannot undergo mitotic division, the erythrocyte has a limited life span of
Explanation: approximately 120 days.
Points Received: 2 of 2
Comments:
Question 6. Question :
What part of the kidney controls renal blood flow, glomerular
filtration, and renin secretion?
Student Macula densa
Answer:
Visceral epithelium
Juxtaglomerular apparatus (JGA)
Filtration slits
Instructor Control of renal blood flow, glomerular filtration, and renin secretion occur at the
Explanation: JGA. Together, the juxtaglomerular cells and macula densa cells form the JGA. The
control of renal blood flow, glomerular filtration, and renin secretion is not directed
by any of the other options.
Points Received: 0 of 2
Comments:
Question 7. Question :
Which congenital heart defects occur in trisomy 13, trisomy 18, and
Down syndrome?
Student Coarctation of the aorta (COA) and pulmonary stenosis (PS)
Answer:
Tetralogy of Fallot and persistent truncus arteriosus
Atrial septal defect (ASD) and dextrocardia
Ventricular septal defect (VSD) and patent ductus arteriosus
