Key words

• Acrosome


  A small vacuole in the tip of the head of a sperm cell, which contains enzymes
• Ciliated epithelial cell


  A cell that lines certain tubes in the body and has cilia on its surface.
• Cilium


  A small hair-like structure on the surface of some cells. Plural is cilia
• Digestion


  A process that breaks molecules into smaller, more soluble substances.
• Diploid


  A cell that has two sets of chromosomes
• Egg cell


  The female gamete (sex cell)
• Enzyme

  A substance that can speed up some processes in living things (e.g. breaking down molecules).
• Epithelial cell

  A cell found on the surfaces of parts of the body.
• Gamete


  A cell used for sexual reproduction
• Haploid


  A cell with one set of chromosomes
• Microvillus


  A fold on the surface of a villus cell. These folds increase the surface area so that digested food is absorbed more quickly. Plural is microvilli.
• Oviduct


  A tube that carries egg cells from the ovaries to the uterus in females. Fertilisation happens here.
• Specialised cell


  A cell that is adapted for a certain specific function (job).
• Sperm cell


  The male gamete(sex cell)