Angina pectoris
Angina is a term that describes a strangling or constrictive
pain. Angina has become synonymous with the heart disorder called Angina
pectoris. This heart disorder refers to chest pain caused by insufficient
supply of oxygen to the heart muscle, usually a result of poor blood supply.
Angina pectoris usually occurs when the demand for oxygen is increased
during exercise and at the time of stress. The pain usually comes on
suddenly. The pain ranges from a tight ache to intense crushing agony. It lasts
for 30 minutes or more and it is not relieved by rest.
Causes of Angina pectoris
(1). Inadequate blood supply to heart due to coronary artery
disease such as atherosclerosis (2). Severe attack of anaemia which
reduces the oxygen carrying capacity of blood. (3). Polycythemia (Increased
number of red blood cells) which thickens the blood, causing it to slow its
flow through the heart muscle. (4). Thyrotoxicosis (a disorder caused by
excessive secretion of thyroxine) can precipitate angina pectoris by making
the heart work harder and faster than its blood supply will permit.
Related Topics in Zoology:
Bio Zoology All Important Topics
- Human Physiology Introduction
- Nutrition
- Carbohydrates Poly hydroxyaldehydes (or) ketones
- Proteins (Polypeptides)
- Lipids
- Vitamins – Functions Of Vitamins
- Deficiency of Vitamin
- Minerals – Water – Role of water
- Balanced diet
- Obesity
- Digestive System
- Dental Caries (Tooth decay)
- Root Canal Treatment
- Peptic ulcer
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- Appendicitis (Appendix)
- Gall Stones
- Hepatitis
- Fractures – Types of fractures
- Mechanism of fracture
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- Types of muscle contraction
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- Mechanism of Breathing
- Regulation of Respiration
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- Bronchitis – Acute bronchitis, Chronic Bronchitis Causes
- Circulatory System – Functioning of Human heart
- Cardiac Cycle
- Coronary blood vessel and its significance
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- Angiogram – Angioplasty
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- Rheumatic Heart Disease (RHD), ICCU – (Intensive Coronary Care Unit)
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- Pulse rate
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- Blood – Composition of plasma – Blood cells
- Clotting of Blood or Haemostasis
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- Memory
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- Alzheimer – Meningitis (Brain fever)
- Conditioned reflex
- Electroencephalography EEG
- Right and Left brain concept
- Spinal cord functioning
- Chemical co-ordination – Functions of Endocrine glands
- Hypothalamus
- Pituitary gland – hormone
- Hormones of Neurohypophysis – vasopressin
- Thyroid gland
- Parathyroid Gland
- Pancreas
- Adrenal gland
- Gonads
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- Photochemistry of Retinal visual Pigments
- Errors of refraction
- Optometry – Retinopathy
- Cataract – Lens Replacement – Glaucoma – Nyctalopia
- Eye Infections and Eye Care
- Ear
- Mechanism of hearing
- Defects of the ear
- Hearing Aid – Noise pollution
- Skin and functions of skin
- Melanin functions
- Effects of solar radiation / UV radiation – Skin grafting
- Dermatitis
- Tongue – Mechanism of Stimulation
- Excretion Ureotelism Nephron
- Mechanism of urine formation
- Renal Failure, Dialysis, Kidney Machines
- Kidney stone – Kidney transplantation
- Diabetes mellitus
- Functioning of male reproductive system
- Functioning of female reproductive system
- Ovulation and fate of the ovum – Menstrual cycle
- Fertilization
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