Biology

Discuss the possible fates of a sperm cell. How many does it really take to fertilize an egg and why? -Acidity of vagina -Secretions of cervix -length of fallopian tubes -Protective shell of egg ————————- 300,000,000 started

Where are sperm deposited of the egg occur? Vagina

Where does fertilization of the egg occur? in the fallopian tube

What propels the egg to the uterus? how long does it take? Muscle contractions in fallopian tubes then cilia 4 days

How many chromosomes does a sperm or egg cell have? Why? 23 fertilization produces diploid zygote

How many oocytes are present at puberty in a female? How many of these will be ovulated in her lifetime? Over 400,000 400 ovulated

What happens to these bypasses after birth? Bypasses shut off, lungs fill with air.

What type of blood is carried by the “D” on the diagram above? “E”? explain this D: O2-rich, coming from placenta (ie mom) E: O2-poor, already circulated thru baby needs to pick up O2 from placenta

Why are there differences from the adult? Lungs are filled with fluid, not much O2. Baby gets O2-rich blood from mom, so it makes sense to “bypass” lungs

Label the structures associated with fetal circulation