TNPSC SCIENCE (ZOOLOGY) PART 2
TNPSC SCIENCE (ZOOLOGY) PART 2
In the tnpsc group 4 exams, science subject plays an important in results of success. Nearly 20 or more questions came from the science. As we analysis the previous year question papers of tnpsc exams, nearly many questions come from the zoology part of science.
TNPSC SCIENCE – ENDOCRINE SYSTEM
Here tnpscwinners provides the some basic facts of human body, which will more useful in the tnpsc group 4, group exams, vao exams and more.
- largest gland = liver
- largest endocrine gland = thyroid
INTEGUMENTARY SYSTEM – TNPSC
- number of cells in body = 75 trillion
- longest cell = neuron (nerve cell)
- Weight of Skin = 4 kg
- Area covered by skin = 1.3 – 1.7 sq.m
- Thinnest skin = conjunctiva
MUSCULAR SYSTEM – TNPSC
- Largest muscle in body = Gluteus maximus (Buttock muscle)
- Largest smooth muscle = uterus of pregnant women
- Smallest muscle in body = Stapedius
- Strongest muscle in body = tongue
NERVOUS SYSTEM – TNPSC
- Number of cranial nerves = 12 pairs
- Number of spinal nerves = 31 pairs
- Longest nerve = Sciatic
- Weight of brain = 1400 gm
- Transmission speed of messages = 290 km/hr
REPRODUCTIVE SYSTEM – TNPSC
- Gestation period = 9 months (253 – 266 days)
- Menstrual cycle = 28 days
- Menopause age = 45 – 50 years
- Volume of semen = 2 – 4 million / ejaculation
- Normal sperm count = 200 – 350 million / ejaculation
RESPIRATORY SYSTEM – TNPSC
- Normal body temperature = 98.4⁰ F or 37⁰ C
- Breathing rate = 16 – 20 per minute
- Average air intake = 6 litres per minute
SKELETAL SYSTEM
In a human there are 206 bones. The bones are made up of calcium, phosphorous, magnesium and some more salts. the bones will give definite shape to our body.
- Longest bone = femur (thigh bone)
- Smallest bone = ear ossicle, stapes
URINARY SYSTEM
- pH of urine = 6.0