Neural tissue is formed by the ________.
A) ectoderm
B) endoderm
C) mesoderm
D) epiderm
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Question 2) Muscle tissue is formed by the ________.
A) epiderm
B) mesoderm
C) ectoderm
D) endoderm
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Question 3) Gastrulation begins when a groove with raised edges called the ________ appears on the dorsal surface of the embryonic disc.
A) notochord
B) placenta
C) primitive streak
D) spinal cord
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Question 4) Shortly after implantation ________.
A) the trophoblast forms two distinct layers
B) the embryo gastrulates (within 3 days)
C) myometrial cells cover and seal off the blastocyst
D) maternal blood sinuses bathe the inner cell mass
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Question 5) Select the correct statement about male sexual response.
A) Expansion of the penile tissues results in dilation of the venous outflow.
B) Erection is the result of vascular spaces in the erectile tissues filling with blood.
C) Ejaculation is the result of parasympathetic stimulation.
D) Sympathetic impulses are responsible for causing penile arteriolar dilation, resulting in erection.
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Question 6) Select the correct statement about fertilization.
A) If estrogen is present, the pathway through the cervical opening is blocked from sperm entry.
B) Both spermatozoa and the ovulated secondary oocyte remain viable for about 72 hours in the female reproductive tract.
C) Once inside the uterus, most sperm cells are protected and remain viable.
D) Millions of sperm cells are destroyed by the vagina's acidic environment.
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Question 7) Which of the choices below is not a function of the vagina?
A) serves as the birth canal
B) receives semen from the penis during sexual intercourse
C) serves as a passageway for menstrual flow
D) serves as a passageway for the primary oocyte
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Question 8) How long is the secondary oocyte viable and capable of being fertilized after it is ovulated?
A) 36-72 hours
B) a full week
C) 12-24 hours
D) 24-36 hours
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Question 9) Erection of the penis results from ________.
A) dilation of the veins in the penis
B) a sympathetic reflex
C) parasympathetic activation of the bulbourethral glands
D) a parasympathetic reflex
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Question 10) Prior to the let-down reflex, the mammary glands secrete a yellowish fluid called ________ that has less lactose than milk and almost no fat.
A) bilirubin
B) colostrum
C) meconium
D) prolactin
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