Living System Revision: Topic Outcomes
How do body systems provide cells with the requirements for life?
Requires systems to provide necessary requirements
to all cells:
Digestive system- Break down food
Circulatory system- Pumps blood around body
transporting oxygen, nutrients & water to cells
Respiratory system- Exchange of gas
Excretory system- Eliminates waste.
Role of the endocrine system.
Regulates how much of each hormone is released.
Endocrine hormones help control mood, growth and
development, the way our organs work, metabolism &
reproduction -uses chemical messengers
Role of the nervous system.
The nervous system along with the endocrine system coordinates & controls various bodily
functions & responses.-uses electrical impulses
Main parts of the nervous system
The PNS is controlled by the central nervous system & is connected to every muscle in the
body. The peripheral nervous system is all the nerves passing information to & from the CNS.
The CNS is composed of the brain & spinal cord.
Receptor Cells
Receive signals and initiate a response
Stimulus-response pathway
1. Stimulus -Eg. There is a loud Noise
2. Receptor- Eg. Ear detects this sound
3. Control Centre- Eg. Brain decides to turn to look at noise
4. Effector- Eg. Muscles turn your head & body
5. Receptor- Eg. Head turns around so you can see the noise.
Neurones
A neurone is a nerve cell that sends messages to & from the brain.
Types of Neurons
*Sensory organs are able to detect & collect information from stimuli.
Sensory neurons- Carry nervous impulses from sensory organs to the CNS.
Interneurons- Found in the CNS. They carry nervous impulses from sensory neurons to motor
neurons.
Motor neurons- Carry nervous impulses from the CNS to the muscles.
Voluntary & Involuntary Response
How do body systems provide cells with the requirements for life?
Requires systems to provide necessary requirements
to all cells:
Digestive system- Break down food
Circulatory system- Pumps blood around body
transporting oxygen, nutrients & water to cells
Respiratory system- Exchange of gas
Excretory system- Eliminates waste.
Role of the endocrine system.
Regulates how much of each hormone is released.
Endocrine hormones help control mood, growth and
development, the way our organs work, metabolism &
reproduction -uses chemical messengers
Role of the nervous system.
The nervous system along with the endocrine system coordinates & controls various bodily
functions & responses.-uses electrical impulses
Main parts of the nervous system
The PNS is controlled by the central nervous system & is connected to every muscle in the
body. The peripheral nervous system is all the nerves passing information to & from the CNS.
The CNS is composed of the brain & spinal cord.
Receptor Cells
Receive signals and initiate a response
Stimulus-response pathway
1. Stimulus -Eg. There is a loud Noise
2. Receptor- Eg. Ear detects this sound
3. Control Centre- Eg. Brain decides to turn to look at noise
4. Effector- Eg. Muscles turn your head & body
5. Receptor- Eg. Head turns around so you can see the noise.
Neurones
A neurone is a nerve cell that sends messages to & from the brain.
Types of Neurons
*Sensory organs are able to detect & collect information from stimuli.
Sensory neurons- Carry nervous impulses from sensory organs to the CNS.
Interneurons- Found in the CNS. They carry nervous impulses from sensory neurons to motor
neurons.
Motor neurons- Carry nervous impulses from the CNS to the muscles.
Voluntary & Involuntary Response
