Azoospermia is the medical condition of a man whose semen contains no sperm. It is associated with infertility, but many forms are amenable to medical treatment. In humans, azoospermia affects about 1% of the male population and may be seen in up to 20% of male infertility situations. 1 Classification 1.1 Pretesticular.
Nematocysts are the stinging cells on tentacles of a cnidarian, like a jellyfish. Since jellyfish don't have any teeth, and their body consists of gelatin, it's hard to captur â¦ e prey.Nematocysts help jellyfish with feeding by stinging the prey in an attempt at trying to immobilizing the prey.hat is a Cnidarian? cnidarians, such as jelly fish, sea anemones, hydra, and corals, have tentacles surrounding their mouth. they are a hollow-bodied animal with two celled layers that are organ â¦ ized into tissues. the inner layer forms a digestive cavity where food is broken down.
Cnidarians take their name from cnidocyte cells, most of which contain a nematocyst-a stinging cell that injects a toxin. Only Cnidarians have nematocysts. All cnidarian forms are either a sedentary polyp or a floating/free-swimming medusa. They have no excretory or respiratory system.onfidence votes 9.4K. The word cnidarian is a very unique word that begins with two consonants. One of only two in the entire English language that begins with 'cn' producing the same sound as the letter 'n' alone.