Human Body Organ System

1) Why Do Our Heart Muscles Not Work According to Our Will but Other Muscles Like the Ones in Our Hands and Legs Do?

• Both our heart muscles and body muscles are made of different muscle tissues.
• The heart constitutes cardiac muscles which are involuntary and cannot be controlled as per our own will, whereas the muscles in limbs are skeletal muscles that can be controlled.

2) Why Does the Pupil of the Eye Shrink When Exposed to Harsh Light at Night?

• The shrinking of the pupil of the eye in front of harsh light at night is a type of reflex action.
• The pupil shrinks to control the amount of light entering the eyes so that it does not harm the sensitive parts of the eye.
• A reflex action is a type of quick action that involves a sudden and instant movement of muscles or organs of the body in response to an external stimulus.

3) Can We Survive With Only One Kidney?

• Yes, we can survive with one kidney.
• The kidney is a vital organ of the excretory system.
• Its primary function is to purify the blood by eliminating waste products through the urine.
• In case one kidney is present in the human body, it needs to perform the function of both kidneys, due to which there are minor changes in the size of the kidney.In case one kidney is present in the human body, it needs to perform the function of both kidneys, due to which there are minor changes in the size of the kidney.

4) Why Are Blood Vessels Like Veins and Arteries Connected to the Heart? What Is the Major Difference Between Them?

• Both arteries and veins are connected to the heart to facilitate blood flow from the heart to various body organs.
• The arteries carry blood away from the heart, whereas the veins carry blood toward the heart