Why is it advantageous that the sperm do not immediately reach the fallopian tubes?
a. The digestive enzymes in the acrosome of the ovum need time to mature, so that the sperm can penetrate the zona pellucida.
b. The digestive enzymes in the acrosome of the sperm need time to mature in the female reproductive tract, so they can penetrate the zona pellucida of the ovum.
c. Time is needed for protease enzymes to cleave proteins on the outer core of the ovum, creating a mature ovum containing a zona pellucida.
d. Time is needed for protease enzymes within the female reproductive tract to cleave proteins on the outer core of the sperm, creating a mature sperm that can penetrate the zona pellucida.
Question 2
What occurs during ovulation to ease the passage of the sperm?
a. The pH of the vagina becomes more acidic.
b. The pH of the vagina becomes more basic.
c. The mucus of the cervix thins out.
d. The mucus of the cervix thickens.
Comparison of the branching air tubes in (a) an insect and (b) a mammal.
Portrait of a Shy Albatross. Note the large, hooked beak and nasal tubes.
Alternative forms of surgeries involving the uterus, ovaries, and fallopian tubes. The solid lines i
Ovaries, uterine tubes, and uterus.
Sperm counts "العدد الطبيعي للحيوانات المنوية"
Insect tracheal system. Chitin rings reinforce branching, air-filled tubes in such respiratory syste