Neurons - Nervous Systems Command and Control Center:...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Nervous Systems Command and Control Center: receive sensory inputs, integrate signals, issue responses Size & complexity: The human brain contains an estimated 100 billion nerve cells, or neurons Complex connections: Each neuron may communicate with thousands of other neurons While the fundamental principles of how neurons function are fairly well understood, the interactions of large numbers of neurons, i.e. perception, emotion, learning & memory, etc., is still the focus of much research Simple pathway Sensor Effector Motor output Integration Sensory input Peripheral nervous system (PNS) Central nervous system (CNS) (sensory neurons) (motor neurons) (interneurons) The Reflex Arc Sensory neurons from the quadriceps also communicate with interneurons in the spinal cord. The interneurons inhibit motor neurons that supply the hamstring (flexor) muscle. This inhibition prevents the hamstring from contracting, which would resist the action of the quadriceps. The sensory neurons communicate with motor neurons that supply the quadriceps. The motor neurons convey signals to the quadriceps, causing it to contract and jerking the lower leg forward. 4 5 6 The reflex is initiated by tapping the tendon connected to the quadriceps (extensor) muscle. 1 Sensors detect a sudden stretch in the quadriceps. 2 Sensory neurons convey the information to the spinal cord....
View Full Document

This note was uploaded on 05/23/2011 for the course BIOLOGY 1520 taught by Professor Davidgarton during the Fall '09 term at Georgia Institute of Technology.

Page1 / 21

Neurons - Nervous Systems Command and Control Center:...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online