University:
Davenport University
Course:
BIOL 115 | Anatomy and Physiology with Human Disease I
Academic year:

2021
Views:

164

Pages:

9
Author:

do3ran7ut

11.1 Functions of Nervous System (1 of 6) • Nervous system is master controlling and communicating system of body • Cells communicate via electrical and chemical signals – Rapid and specific – Usually cause almost immediate responses 11.1 Functions of Nervous System (2 of 6) • Nervous system has three overlapping functions 1. Sensory input  Information gathered by sensory receptors about internal and external changes 2. Integration  Processing and interpretation of sensory input 3. Motor output  Activation of effector organs (muscles and glands) produces a response The Nervous System’s Functions Figure 11.1 The nervous system’s functions. 11.1 Functions of Nervous System (3 of 6) • Nervous system is divided into two principal parts: – Central nervous system (CNS)  Brain and spinal cord of dorsal body cavity  Integration and control center – Interprets sensory input and dictates motor output – Peripheral nervous system (PNS)  The portion of nervous system outside CNS  Consists mainly of nerves that extend from brain and spinal cord – Spinal nerves to and from spinal cord – Cranial nerves to and from brain The Nervous System Figure 11.2 The nervous system. 11.1 Functions of Nervous System (4 of 6) • Peripheral nervous system (PNS) has two functional divisions – Sensory (afferent) division  Somatic sensory fibers: convey impulses from skin, skeletal muscles, and joints to CNS  Visceral sensory fibers: convey impulses from visceral organs to CNS – Motor (efferent) division  Transmits impulses from CNS to effector organs – Muscles and glands  Two divisions – Somatic nervous system – Autonomic nervous system 11.1 Functions of Nervous System (5 of 6) • Somatic nervous system – Somatic motor nerve fibers conduct impulses from CNS to skeletal muscle – Voluntary nervous system  Conscious control of skeletal muscles 11.1 Functions of Nervous System (6 of 6) • Autonomic nervous system – Consists of visceral motor nerve fibers – Regulates smooth muscle, cardiac muscle, and glands – Involuntary nervous system – Two functional subdivisions  Sympathetic  Parasympathetic  Work in opposition to each other Organization of the Nervous System Figure 11.3 Organization of the nervous system.