health science

Which part of the sperm contains the nucleus and enzymes to penetrate the egg?

• Tail

• Middle piece

• Head

• Zona pellucida

What is the role of the zona pellucida in fertilization?

• Provides energy for sperm motility

• Protects the oocyte and regulates sperm entry

• Releases enzymes for egg binding

• Supports early development with nutrients

During which time frame is fertilization most likely to occur after ovulation?

• 1-2 days

• 3-4 days

• 6-12 hours

• 12-24 hours

What occurs during the acrosomal reaction in fertilization?

• Sperm transfers its nucleus

• Sperm and egg membranes fuse

• Enzymes are released to break down the zona pellucida

• Seminal coatings break off

Which step in fertilization involves the release of cortical enzymes from the oocyte?

• Capacitation

• Sperm binding

• Acrosomal reaction

• Cortical reaction

What is the primary function of hormonal methods of contraception?

• To physically block sperm from reaching the egg

• To change hormones to prevent ovulation

• To nourish the embryo

• To enhance fertilization

Which of the following is a barrier method of contraception?

• Hormonal IUD

• Rod implant

• Male condom

• Plan B

During which week does gastrulation typically occur, and what is its significance?

• Week 1; formation of the zygote

• Week 3; division into three germ layers

• Week 5; development of the placenta

• Week 9; organ refinement

What is the role of stem cells in the body?

• They form the outer layer of the blastocyst

• They are undifferentiated cells that can become different cell types

• They are responsible for the formation of the neural tube

• They prevent pregnancy by changing hormones

What is the difference between an embryo and a foetus in terms of development stages?

• An embryo is from conception to week 8; a foetus is from week 9 to birth

• An embryo is from week 9 to birth; a foetus is from conception to week 8

• An embryo is a single cell; a foetus is a solid ball of cells

• An embryo is a germ layer; a foetus is a neural tube