Curriculum & Exam Preparation Note: Regular practice of NCERT textbook exercises and chapter-end questions establishes strong conceptual clarity for primary and secondary examinations.
- Normal Sperm Count:- 250-400 million/ejaculation
- Menstrual cycle:- 28 days
- Menopause age:- 45-50 years
- Blood clotting time:- 3-5 minutes
- Weight of Brain:- 1300-1400 gm in human adult
- Normal Blood Pressure (B.P.):- 120/80 mm Hg
- Average body weight:- 70 kg
- Normal body temperature:- 37 degree celsius
- Breathing Rate at rest:- 12-16/minute
- Number of Spinal Nerves:- 31 pairs
- Largest Endocrine Gland:- Thyroid gland
- Gestation period:- 40 weeks or 9 calendar months
- Normal Heart Beat at rest:- 72 beats per minute
- Largest Gland:- Liver
- Largest Muscle in the body:- Gluteus Maximus or Buttock Muscle
- Smallest Muscle in the body:- Stapedius
- Largest Artery:- Aorta
- Largest Vein:- Inferior Vena Cava
- Largest and longest Nerve:- Sciatic Nerve
- Longest Cell:- Neurons (nerve cells)
- Minimum distance for proper vision:- 25 cm
- Largest and strongest Bone in the body:- Femur (thigh bone)
- Smallest Bone in the body:-Stapes in ear
- Number of Cells in the body:- 75 trillion
- Volume of Blood in the body:- 6 litres (in 70 kg body)
- Number of Red Blood Cells(R.B.C.):- In male: 5 to 6 million/cubic mm, In female: 4 to 5 million/cubic mm
- Life span of Red Blood Cells(R.B.C.):- 100 to 120 days
- Life span of White Blood Cell(W.B.C.):- 3-4 days
- Normal White Blood Cell(W.B.C.) count:- 5000-10000/cubic mm
- Time taken by R.B.C. to complete one cycle of circulation:- 20 seconds
- Other name of Red Blood Cell (R.B.C.):- Erythrocytes
- Largest White Blood Cells:- Monocytes
- Smallest White Blood Cells:- Lymphocyte
- Who discovered Blood Group:- Karl Landsteiner
- Blood Platelets count:- 150,000 - 400,000 platelets per micro litre
- Haemoglobin (Hb):- In male: 14-15 gm/100 c.c. of blood, In female: 11-14 gm/100 c.c. of blood
- Hb content in body:- 500-700 gm
- pH of Urine:- 6.5-8
- pH of Blood:- 7.36-7.41
- Volume of Semen:- 2-5 ml/ejaculation
- Pulse rate:- 72 per minute
- Thinnest Skin:- Eyelids
- Weight of Heart:- 200-300 gm