Unit 3.1
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What are the three system performances of the nervous system?
Sensation - Analyses sensory information from external environments. Integration - Some information is stored and decisions are made about responses to sensory information. Response - Motor responses are brought about, initiating muscular contractions ir secretions from glands.
What can the nervous system be divided into?
Nervous System | v CNS PNS | | v v brain and SNS and ANS spinal cord | v Sympathetic and Parasympathetic
What does the peripheral nervous system (PNS) consist of?
The somatic nervous system (SNS) and the autonomic nervous system (ANS)
What does the somatic system contain and what does it do?
Sensory and motor neurons (nerves). It control the VOLUNTARY movement of skeletal muscles.
What processes do sympathetic and parasympathetic systems effect?
Sympathetic: Heart rate - Increases Breathing - Increases Peristalsis - Decreases Production of intestinal secretions - decreases Parasympathetic: Heart rate - Decreases Breathing - Decreases Peristalsis - Increase Production of intestinal secretions - Increase
What do converging neural pathways do?
Several neurons travel to one neuron. This increases the sensitivity to excitatory or inhibitory signals.
What do diverging neural pathways do?
The route along which an impulse is travelling divides. Impulses from one neuron travel to several neurons so affecting more than one destination at the same time
What do reverberating neural pathways do?
Neurons later in the pathway link with earlier neurons, sending the impulse back through the pathway. This allows repeated stimulation of the pathway.