Challenge your understanding of human anatomy and physiology with a set of easy questions covering major organs, body systems, and their functions.
Which is the longest bone in the human body?
Explanation: The femur is the longest bone in the human body. The tibia and humerus are also long bones, but both are shorter than the femur. The clavicle (collarbone) is much shorter than all the others listed.
What is the largest organ of the human body?
Explanation: Skin is the largest organ, covering the entire body and protecting internal structures. The liver is the largest internal organ, but it is smaller than the skin. The heart and brain are vital organs but are smaller in size.
Which system is responsible for transporting blood throughout the human body?
Explanation: The circulatory system moves blood using the heart and blood vessels. The nervous system controls signals, the digestive system processes food, and the respiratory system manages breathing, not blood transport.
What is considered the basic unit of life in the human body?
Explanation: Cells are the fundamental units of life; all living things are made from one or more cells. Tissues are groups of cells, organs are groups of tissues, and organisms are the complete living being, but all are built from cells.
How many bones are in the adult human body?
Explanation: An average adult human has 206 bones. 205, 201, and 208 are incorrect; most adults complete bone fusion with a total of 206 bones.
Which hormone is responsible for regulating blood sugar levels?
Explanation: Insulin regulates blood sugar; it helps cells absorb glucose. Adrenaline prepares the body for 'fight or flight,' melatonin controls sleep, and cortisol manages stress, not blood sugar.
What is the main function of red blood cells?
Explanation: Red blood cells transport oxygen from the lungs to the body tissues. Fighting infections is the job of white blood cells, clotting is handled by platelets, and hormone production is done by glands.
Which part of the brain is responsible for balance and coordination?
Explanation: The cerebellum controls balance and coordination. The cerebrum manages thought and action, the medulla controls vital functions like breathing, and the hypothalamus regulates body temperature.
Which type of blood vessel carries blood away from the heart?
Explanation: Arteries carry blood away from the heart. Veins return blood to the heart, capillaries exchange substances, and lymphatic vessels transport lymph, not blood.
Which part of the eye controls the amount of light entering?
Explanation: The iris adjusts pupil size to control light entry. The retina processes images, the lens focuses light, and the cornea covers the front of the eye but does not adjust light amount.