Eduqo

General Science›Ch 3: Biology›Nervous and Endocrine Systems

3.7

Nervous and Endocrine Systems

5 min

Master brain, reflex action, glands, hormones, insulin, thyroxine & pituitary gland for competitive exams.

1

The Golden Rule

The nervous system controls rapid responses via electrical impulses, while the endocrine system regulates slow metabolic activities through hormones. Together, they maintain body homeostasis and coordinate all vital physiological functions seamlessly.

2

Exam Value & Weightage

  • 1 to 2 questions appear in SSC, Railway, and State PCS exams regularly.
  • Direct factual questions asked on brain parts, deficiency diseases, and glands.
  • High scoring topic if reflex arc and hormone functions are revised properly.

Memory Hooks

  • Cerebrum = Think and Memory; Cerebellum = Balance and Posture.
  • Pituitary = Master Gland; Hypothalamus = Master of Master Gland.
  • Insulin from Pancreas lowers sugar; Thyroxine needs Iodine to work.
3

Major Glands & Hormones

GlandHormoneFunction
ThyroidThyroxineControls BMR
PancreasInsulinLowers blood sugar
AdrenalAdrenalineFight or flight
PituitaryGrowth HormoneBody growth
4

Core Anatomy & Reflex

Cerebrum

(Main thinking part)

Cerebrum: Main thinking part

Main thinking part

Cerebrum handles reasoning, memory, and voluntary actions.

Medulla

(Involuntary control center)

Medulla: Involuntary control center

Involuntary control center

Medulla oblongata controls heartbeat and breathing.

Reflex Arc

(Rapid automatic response)

Reflex Arc: Rapid automatic response

Rapid automatic response

Reflex arc bypasses brain for instant withdrawal from heat.

Pituitary

(Master endocrine gland)

Pituitary: Master endocrine gland

Master endocrine gland

Pituitary gland secretes hormones regulating other glands.

5

Exam Traps & Pitfalls

Hypothalamus is a gland, not brain partIt is a part of the forebrain

Exams trick you by calling Hypothalamus an isolated gland. It is actually a vital region of the brain controlling the pituitary gland.

Cerebellum controls intelligenceCerebrum controls intelligence

Students often confuse Cerebrum with Cerebellum. Cerebrum handles memory and thinking; Cerebellum coordinates muscle balance.

Reflex actions are controlled by cerebrumReflex actions are controlled by spinal cord

Reflex actions are quick and mediated primarily by the spinal cord to save time, not the thinking brain.

6

Test Your Knowledge

Q1.Which part of the human brain maintains posture, equilibrium, and muscular coordination?

Q2.Which gland is known as the master gland because it regulates other endocrine glands?

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