Question

QUESTION 2
Homeostasis is the maintenance of a relatively stable internal environment by self-regulating
physiological processes. Write about Homeostasis (Total 35: marks)

Answer 1

The human body carries out various types of cellular activities. To carry out these activities a stable internal environment is required. The body maintains a stable internal environment such as pH, temperature, water and electrolyte balance, blood pressure etc which is known as homeostasis.
The homeostasis is maintained through megative and positive feedback system regulated by neuroendocrine system.
Homeostasis consists of a feedback loop. The loop consists of a receptor that perceives a stimulus and sends it to the integrating centre through sensory nerves. Integrating centre is the controlling centre mainly the hypothalamus that process the sensory information and sends correcting signal to the effector organ. The effector then release hormones that acts on target tissue and alter their activity to maintain homeostasis.