Question 1

Out of the 300 million ejaculated sperm,only about __________ reach the vicinity of the egg.

Accepted Answer

A)  20 to 30
B)  200 to 300
C)  2000 to 3000
D)  20,000 to 30,000
E)  halfF) B) and E)
G) All of the above

Question 2

Which of the following major events of prenatal development happens first?

Accepted Answer

A)  The eyes are fully open
B)  The body is covered with lanugo
C)  Bone calcification begins
D)  The central nervous system begins to form
E)  Meconium accumulates in the intestinesF) A) and B)
G) B) and E)

Question 3

Primary germ layers are formed during __________

Accepted Answer

A)  implantation
B)  cleavage
C)  conception
D)  organogenesis
E)  gastrulationF) All of the above
G) C) and E)

Question 4

The __________ completely encloses the embryo and provides it with a stable environment.

Accepted Answer

A)  yolk sac
B)  amnion
C)  chorion
D)  chorionic villus
E)  allantoisF) A) and D)
G) A) and E)

Question 5

In the slow block to polyspermy,sperm penetration releases an inflow of __________,which in turn stimulates the __________.

Accepted Answer

A)  Cl-; corona radiata
B)  K+; zona pellucida
C)  Na+; fertilization membrane
D)  Ca2+; fertilization membrane
E)  Ca2+; cortical reactionF) A) and B)
G) B) and D)

Question 6

Prior to ejaculation,__________ in the plasma membrane of the sperm prevents premature release of __________.

Accepted Answer

A)  cholesterol; acrosomal enzymes
B)  protein; acrosomal enzymes
C)  carbohydrates; prostaglandins
D)  hyaluronic acid; prostaglandins
E)  acrosin and hyaluronidase; acrosomal enzymesF) A) and B)
G) None of the above

Question 7

In fetal circulation,the __________ bypasses the liver and the __________ bypasses the lungs.

Accepted Answer

A)  ligamentum venosum; ligamentum arteriosum
B)  foramen ovale; ductus venosus
C)  ductus arteriosus; ductus venosus
D)  ductus venosus; ductus arteriosus
E)  ligamentum arteriosum; foramen ovaleF) A) and E)
G) A) and B)

Exam 29: Human Development and Aging

In fetal circulation,the bypasses the liver and the bypasses the lungs.

Correct Answer
verified

Primary germ layers are formed during __________

Correct Answer
verified

In the slow block to polyspermy,sperm penetration releases an inflow of ,which in turn stimulates the .

Correct Answer
verified

Out of the 300 million ejaculated sperm,only about __________ reach the vicinity of the egg.

Correct Answer
verified

Which of the following major events of prenatal development happens first?

Correct Answer
verified

Prior to ejaculation, in the plasma membrane of the sperm prevents premature release of .

Correct Answer
verified

The __________ completely encloses the embryo and provides it with a stable environment.

Correct Answer
verified

Exam 29: Human Development and Aging

In fetal circulation,the __________ bypasses the liver and the __________ bypasses the lungs.

Correct AnswerverifiedShow Answer

Primary germ layers are formed during __________

Correct AnswerverifiedShow Answer

In the slow block to polyspermy,sperm penetration releases an inflow of __________,which in turn stimulates the __________.

Correct AnswerverifiedShow Answer

Out of the 300 million ejaculated sperm,only about __________ reach the vicinity of the egg.

Correct AnswerverifiedShow Answer

Which of the following major events of prenatal development happens first?

Correct AnswerverifiedShow Answer

Prior to ejaculation,__________ in the plasma membrane of the sperm prevents premature release of __________.

Correct AnswerverifiedShow Answer

The __________ completely encloses the embryo and provides it with a stable environment.

Correct AnswerverifiedShow Answer

In fetal circulation,the bypasses the liver and the bypasses the lungs.

Correct Answer
verified

Correct Answer
verified

In the slow block to polyspermy,sperm penetration releases an inflow of ,which in turn stimulates the .

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Prior to ejaculation, in the plasma membrane of the sperm prevents premature release of .

Correct Answer
verified

Correct Answer
verified