Multiple Choice
In the fast block to polyspermy, binding of sperm opens up channels, which depolarizes the egg membrane and .
A) Na+; prevents the entrance of any more sperm
B) Na+; prevents the entrance of more Na+
C) Na+; prevents the entrance of Ca₂+
D) Ca₂+; prevents the entrance of any more sperm
E) Ca₂+; prevents the entrance of more Na+
Correct Answer:

Verified
Correct Answer:
Verified
Q22: Senescence of the immune system makes older
Q23: The digital rays of a fetus give
Q23: The chorion forms the fetal part of
Q25: In the slow block to polyspermy, sperm
Q29: By the time the conceptus arrives in
Q31: Which of these organ systems faces the
Q51: Sperm must travel to the distal end
Q62: Neonatal immunity depends on IgG and IgA
Q121: Only autosomal trisomies involving chromosomes 13, 18,
Q142: By the end of 8 weeks, the