cells and control Flashcards
what is a synapse
connection between two neurones
how are nerve signals transferred across a synapse
neurotransmitters diffuse across the synapse and set off a new electrical impulse in the next neurone
T or F
muscles and glands are examples of receptors
false they are effectors
in humans what does the central nervous system consist of
the brain and the spinal cord
which type of neurone carries impulses from the central nervous system to the effectors
motor neurone
what is an embryonic stem cell
an undifferentiated cell found in early human embryos
where can stem cells be found in an adult human
bone marrow
what do human stem cells do
used to replace damaged cells such as blood or skin cells
what type of plant tissue contains stem cells
meristem tissue
describe two potential risks of using stem cells in medicine
donor cells may be contaminated
if they divide too quickly and tumour may develop
what is mitosis
the stage of the cell cycle when the cell divides
what is mitosis used for
to grow and replace cells that have been damaged
name the four stages of the cell cycle that are part of mitosis
prophase
metaphase
anaphase
telophase
what happens during cytokinesis
the cytoplasm and cell membrane divide to form two separate cells
name the two methods that’s plants use to grow
cell division
cell elongation
