Life Sciences: Human nervous system and receptors
Module 1
1.5: Human nervous system and receptors
Coordinating systems
Nervous System
Human Nervous System
-Central nervous system
Brain
Spinal cord
-Peripheral nervous system
Somatic Nervous system
Autonomic nervous system
Nervous Tissue
-Nerves
-Nerve impulses
-Synapses
-A simple reflex arc
Disorders of the nervous system
, Coordinating systems
= systems that allow communication between the receptors and the effectors of the body so that correct reactions
to any change in the environment can be brought about
systems work together to enable animal to respond to environment
Nervous coordinating system Responds fastest and brought about by impulses
travelling along nerves
Endocrine coordinating system Slower and brought about by chemicals called
hormones which are carried to the blood
Nervous System
Nervous system Control and communication centre
How does it function?
Sensory function Integrative function Motor Function
>sensory receptors detect the >central nervous system receives >effectors (muscles and glands)
changes in the external /internal information and ‘decide’ which bring about appropriate responses
environment effectors need to react to stimulus
What are stimuli?
Stimuli= physical or chemical External stimuli Internal stimuli
changes in the
environment ,capable of causing a Light Blood pressure
response in an organism Temperature Blood pH
Sounds Tension in muscle
Atmospheric pressure
Human Nervous System
Central nervous system
Made up: A mass of interconnected neurons, forming :
Brain
Spinal cord
How it is protected: -brain/spinal cord tissue extremely soft and delicate,
therefore they are protected and nourished by tissue
membranes called meninges
-space between 2nd/3rd membranes filled with cerebo-
spinal fluid, acts as cushion
-whole CNS and meninges enclosed in bony cases
-cranium
-vertebral column
Module 1
1.5: Human nervous system and receptors
Coordinating systems
Nervous System
Human Nervous System
-Central nervous system
Brain
Spinal cord
-Peripheral nervous system
Somatic Nervous system
Autonomic nervous system
Nervous Tissue
-Nerves
-Nerve impulses
-Synapses
-A simple reflex arc
Disorders of the nervous system
, Coordinating systems
= systems that allow communication between the receptors and the effectors of the body so that correct reactions
to any change in the environment can be brought about
systems work together to enable animal to respond to environment
Nervous coordinating system Responds fastest and brought about by impulses
travelling along nerves
Endocrine coordinating system Slower and brought about by chemicals called
hormones which are carried to the blood
Nervous System
Nervous system Control and communication centre
How does it function?
Sensory function Integrative function Motor Function
>sensory receptors detect the >central nervous system receives >effectors (muscles and glands)
changes in the external /internal information and ‘decide’ which bring about appropriate responses
environment effectors need to react to stimulus
What are stimuli?
Stimuli= physical or chemical External stimuli Internal stimuli
changes in the
environment ,capable of causing a Light Blood pressure
response in an organism Temperature Blood pH
Sounds Tension in muscle
Atmospheric pressure
Human Nervous System
Central nervous system
Made up: A mass of interconnected neurons, forming :
Brain
Spinal cord
How it is protected: -brain/spinal cord tissue extremely soft and delicate,
therefore they are protected and nourished by tissue
membranes called meninges
-space between 2nd/3rd membranes filled with cerebo-
spinal fluid, acts as cushion
-whole CNS and meninges enclosed in bony cases
-cranium
-vertebral column
