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Lecture 1

EXSC 224 Lecture 1: Lecture 1 - 8/18

Exercise Science
Course Code
EXSC 224

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4 essential Concepts in Physiology
1. Principle of Complementarity
Physiology is dependent to anatomy
2.Physiology uses gradients
Ex. Sodium potassium pump
Potential energy - physiology harnesses the gradient to do something
Regulate protein function by regulating its shape
Ex. phosphorylation, pH, temperature
4. Negative feedback regulation is essential to homeostasis
Chapter 11
Nervous system - 3 things
1. Sensory input
Information gathered by sensory receptors about internal and external
2. Integration
Travels to CNS to be processed
Interpretation of sensory input
Subconscious or conscious decisions can be made
3. Motor output
Voluntary or involuntary
Activation of effector organs (muscles and glands) produces a response
CNS - brain and spinal cord
Integrative and control centers
PNS - everything else that branches off of brain and spinal cord, cranial and spinal
Communication lines between the CNS and the rest of the body
PNS - Peripheral nervous system
Sensory (afferent) division
Somatic and visceral sensory nerve fibers
Conducts impulses from receptors to the CNS
Somatic = skin/sensory
Visceral = organ(like stomach)
Motor (efferent) division
Motor nerve fibers
Conducts impulses from the CNS to effectors (muscles and glands)
Away from central nervous system
■ Somatic/voluntary
Somatic motor
Conducts impulses from the CNS to skeletal muscles
Autonomic/involuntary systems
Visceral motor, involuntary
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