NEKEMTE EVENING TUTORIAL CLASS(NETC)

Biology Grade 12 full shortnotes

grade 11 bio

Important Facts About Human Body  🔸 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 🔸 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