12th Zoology

Deficiency of Vitamin

Deficiency of Vitamin

The Deficiency of Vitamin / Vitamin Deficiency Ailments are discussed in this page.

Deficiency of Vitamin A

1. Atrophy of lacrymal glands of the eye and reduction in tear secretion
2. Corneal epithilium becomes red and dry (xerosis). It may also
become wrinkled and Keratinised (xeropthalmia). Appearance of
Bitot’s spot in the cornea might happen.
3. Cornea may get necrosed and get infected (keratomalacia).
4. May cause night blindness (nyctalopia).

Deficiency of Vitamin D

Defective calcification of bone, deficiency of vitamin-D, causes
rickets in growing children and osteomalacia in adults.

Vitamin E Deficiency

Rare in human, sterility in experimental animals.

Deficiency of Vitamin K 

1. Lack of vitamin K leads to defect in blood coagulation.
2. In humans, vitamins K deficiency leads to haemorrhagic
manifestations.

Vitamin B1 Deficiency

Gross deficiency of vitamins B1, leads to a condition known as beri
beri. Beriberi affects nervous and cardiovascular systems.In children and
infants the onset is acute.

Deficiency of Vitamin B2 

Loss of appetite and other gastro-intestinal symptoms, soreness and
burning of lips, mouth and tongue. Fissures appear at edges of the mouth.

Vitamin Niacin Deficiency

Its deficiency leads to pellagra. The principal symptoms of pellagra
include mental changes, (dementia) dermatitis and stomatitis. The tongue
becomes smooth, red and painful.

Deficiency of Vitamin B6: (Pyridoxine)

In human pyridoxine deficiency causes dermatitis around eyes, nose
and behind the ears. Fissures appear above the lips and angles of the mouth.

Vitamin B12 Deficiency

Its deficiency causes pernicious anaemia, typical sore
tongue and several neurological problems related to the spinal cord.

Vitamin C Deficiency

Its deficiency in the body leads to scurvy, a diseses charaterised
by bleeding gums, loosening and falling out of teeth and intra muscular
haemorrages. In the absence of this vitamin the collagen and connective
tissue proteins are not synthesised properly.

Related Topics in Zoology:

Bio Zoology All Important Topics


  1. Human Physiology Introduction

  2. Nutrition

  3. Carbohydrates Poly hydroxyaldehydes (or) ketones

  4. Proteins (Polypeptides)

  5. Lipids

  6. Vitamins – Functions Of Vitamins

  7. Deficiency of Vitamin

  8. Minerals – Water – Role of water

  9. Balanced diet

  10. Obesity

  11. Digestive System

  12. Dental Caries (Tooth decay)

  13. Root Canal Treatment

  14. Peptic ulcer

  15. Hernia and Types

  16. Appendicitis (Appendix)

  17. Gall Stones

  18. Hepatitis

  19. Fractures – Types of fractures

  20. Mechanism of fracture

  21. Dislocation of joints

  22. Arthiritis

  23. Rickets and Osteomalacia – Orthopedics

  24. Muscles

  25. Mechanism of muscle contraction

  26. Types of muscle contraction

  27. Myasthenia Gravis

  28. Respiration – Process of pulmonary respiration

  29. Mechanism of Breathing

  30. Regulation of Respiration

  31. Pneumonia Tuberculosis Symptoms Treatment

  32. Bronchitis – Acute bronchitis, Chronic Bronchitis Causes

  33. Circulatory System – Functioning of Human heart

  34. Cardiac Cycle

  35. Coronary blood vessel and its significance

  36. Myocardial infarction

  37. Angina pectoris

  38. Angiogram – Angioplasty

  39. Atherosclerosis

  40. Heart block Echo cardiography Heart Valves

  41. Rheumatic Heart Disease (RHD), ICCU – (Intensive Coronary Care Unit)

  42. Blood Pressure

  43. Heart transplantation

  44. Pulse rate

  45. Cardio Pulmonary Resuscitation (CPR)

  46. Blood – Composition of plasma – Blood cells

  47. Clotting of Blood or Haemostasis

  48. Thrombosis

  49. Nervous system Co-ordination systems

  50. The Brain – Fore Brain, Midbrain, Hindbrain

  51. Memory

  52. Sleep – Types of sleep

  53. Stroke – Brain haemorrhage

  54. Alzheimer – Meningitis (Brain fever)

  55. Conditioned reflex

  56. Electroencephalography EEG

  57. Right and Left brain concept

  58. Spinal cord functioning

  59. Chemical co-ordination – Functions of Endocrine glands

  60. Hypothalamus

  61. Pituitary gland – hormone

  62. Hormones of Neurohypophysis – vasopressin

  63. Thyroid gland

  64. Parathyroid Gland

  65. Pancreas

  66. Adrenal gland

  67. Gonads

  68. Receptor Organs – Eye

  69. Photochemistry of Retinal visual Pigments

  70. Errors of refraction

  71. Optometry – Retinopathy

  72. Cataract – Lens Replacement – Glaucoma – Nyctalopia

  73. Eye Infections and Eye Care

  74. Ear

  75. Mechanism of hearing

  76. Defects of the ear

  77. Hearing Aid – Noise pollution

  78. Skin and functions of skin

  79. Melanin functions

  80. Effects of solar radiation / UV radiation – Skin grafting

  81. Dermatitis

  82. Tongue – Mechanism of Stimulation

  83. Excretion Ureotelism Nephron

  84. Mechanism of urine formation

  85. Renal Failure, Dialysis, Kidney Machines

  86. Kidney stone – Kidney transplantation

  87. Diabetes mellitus

  88. Functioning of male reproductive system

  89. Functioning of female reproductive system

  90. Ovulation and fate of the ovum – Menstrual cycle

  91. Fertilization

  92. Birth control

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