specialisation- animal cells Flashcards
(12 cards)
how many chromosomes do sperm cells contain
23 (half of normal adult cell)
why do sperm cells have a long tail
allows them to swim to the ovum
why is the sperm cell packed full of mitochondria
provides energy needed for swimming
why do sperm cells contain enzymes
allows them to digest their way through the outer layer of the ovum
what does the axon do
carries the electrical impulses from one part of the body to another
what is the axon covered in
myelin
why is the axon covered in myelin
insulates the axon and speeds up the transmission of nerve impulses
what are synapses
junctions which allow the impulse to pass from one nerve cell to another
what do dendrites do in nerve cells
increase surface area so that other nerve cells can connect more easily
what do muscle cells do
contract
why do muscle cells contain protein fibres
shorten the when the cell contracts making it smaller
why are muscle cells packed full of mitochondria
provide energy for muscle contraction
