Producing New Cells and Control & Communication Flashcards
MEMORISE
cell division is controlled by:
nucleus
Three distinct region of the brain:
- Cerebrum
- Cerebellum
- Medulla
Responsible for controlling balance and co-ordination
Cerebellum
Enables conscious thoughts and memory
Cerebrum
Controls breathing and heart rates
Medulla
The Nervous system:
- brain
- spinal cord
- nerves
The Central nervous system:
- Brain
- Spinal Cord
What does nerves uses to send messages from one part of the nervous system to another
-Electrical impulses
Stimuli - Receptors:
Sensory neuron
Motor Neuron - Effectors:
Responses
Reflex actions are:
rapid, involuntary responses to stimuli that indicate the body could be in danger.
gaps between neurons where chemicals are released:
Synapses
Chemical messengers release directly into the bloodstream by:
endocrine
Chemical messengers that are released directly into the bloodstream are called
Hormones
If mitosis becomes uncontrolled this can lead to:
the formation of cancer cells and tumours
Adults tissue stem cells can only:
produce a few different cell types
example: bone marrow
Cells are different in appearance and :
function due to having become specialised.
Guard Cell:
Function: Allows gases in and out of leaves
Adaptation: cells change shape due to water content that controls pore size
Neuron
Function: deliver electrical impulses
Adaptation: long and thin with many projections to allow communication with other neurons
Red blood cells
Function: carries oxygen around the body
adaptation: large surface area and no nucleus to carry more haemoglobin that binds oxygen
root hair cell
function: absorbs water
adaptation: large extensions to increase surface area
