Define an electrocardiogram.
An electrocardiogram is a recording of the electric activity of the heart. An electrocardiogram (E.C.G) is a simple, noninvasive procedure. Electrodes are placed on the skin of the chest and connected in a specific order to a machine that, when turned on, measures electrical activity all over the heart. Output usually appears on a long scroll of paper that displays a printed graph of activity on a computer screen.
What are the four types of brain waves and distinguish between them. Alpha waves – have frequency of (8-13 Hz). Waves are regular and rhythmic, are synchronous and have low amplitude. They signify an awake but calm brain. Beta waves – have frequency of (14-30 Hz). Waves are rhythmic but not so regular, and have higher frequencies. They signify wakefulness and alertness. Theta waves- have frequency of (4-7 Hz) and are even more irregular. Mainly found in children, but may appear in adults when engaging in deep mental activity. Delta waves- have a frequency 4 Hz or less. Waves have high amplitude. Occurs during deep sleep and when the reticular activating system is damped. Also signifies brain damage in adults.
Give a clinical definition of consciousness.
Consciousness is clear state of aware of one’s self and the environment in which attention is focused on immediate matter, as distinguish from mental activity of an unconscious or subconscious nature. 4.
What are two major types of sleep and what happens in each phase? There are 2 different types of sleep. REM, which stands for rapid eye movement and NREM which stands for non-rapid eye movement. NREM is the first type of sleep you enter into when you first fall asleep. Most of our time asleep is spent here, making up for 75% of an adults sleep. NREM is split into 3 stages, with each stage taking you deeper and deeper into sleep. NREM stage 1 this is the first stage of NREM, starting from the moment you first fall asleep. Your brain begins preparing you for...
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