HESC1501 Lecture Notes - Lecture 4: Anatomical Terms Of Location, Motor Neuron, Myocyte

• School: UNSW, UNSW Sydney
• Department: Health and Exercise Science
• Course: HESC1501
• Professor: keesh

Document Summary

Lecture 4 - 13/03/18 - anatomical basis of movement: muscles. Muscle tissue types: cardiac, striated, rhythmic and sequential propulsion of blood across heart chambers. Naming skeletal msucles: location, shape, relative size, direction of fascicles, location of attachment, number of origins, action. Isometric: muscle length is unchanged, maintain posture, stabilise joints, concentric, muscle shortens, produces movement, eccentric, muscle is active but lengthening, controls movement. Irritability - they are excited by various types of stimulai: chemical, mechanical, thermal, conductivity - they can transmit an impulse electrically from one part of the cell to another. Sensory and motor neurons: sensory - conduct impulses from peripheral organs to the cns, motor - conduct impulses from the cns to effector organs (muscle and glands) Synapses: neurons make connections with each other at synapses. The neuromuscular junction: when the impulse in the motor neuron reaches the muscle it releases a neurotransmitter chemical called acetylcholine, acetylcholine activates receptors on the muscle surface causing muscle fibres to contract.