Human body systems and health (e.g., digestion, respiration, circulation) MCQs in Everyday Science [General] MCQs in Everyday Science [General]

Which of the following is the primary function of the digestive system?
- a) Oxygenating blood
- b) Breaking down food and absorbing nutrients
- c) Regulating body temperature
- d) Protecting the body from infections
  Answer: b) Breaking down food and absorbing nutrients
What organ is responsible for pumping blood throughout the human body?
- a) Lungs
- b) Brain
- c) Heart
- d) Liver
  Answer: c) Heart
Which system in the human body is responsible for the exchange of gases?
- a) Digestive system
- b) Circulatory system
- c) Respiratory system
- d) Nervous system
  Answer: c) Respiratory system
Which of the following is NOT part of the circulatory system?
- a) Arteries
- b) Veins
- c) Lymph nodes
- d) Esophagus
  Answer: d) Esophagus
Which of these blood components is primarily responsible for clotting?
- a) Red blood cells
- b) White blood cells
- c) Platelets
- d) Plasma
  Answer: c) Platelets

The process by which the body takes in oxygen and expels carbon dioxide is called:
- a) Digestion
- b) Circulation
- c) Respiration
- d) Excretion
  Answer: c) Respiration
Which part of the digestive system is mainly responsible for water absorption?
- a) Stomach
- b) Small intestine
- c) Large intestine
- d) Liver
  Answer: c) Large intestine
Which hormone regulates blood sugar levels in the body?
- a) Insulin
- b) Adrenaline
- c) Thyroxine
- d) Estrogen
  Answer: a) Insulin
What is the primary function of the kidneys?
- a) Regulate blood pressure
- b) Filter waste from the blood
- c) Produce hormones
- d) Break down fats
  Answer: b) Filter waste from the blood

Which part of the nervous system controls voluntary muscle movements?
- a) Autonomic nervous system
- b) Somatic nervous system
- c) Central nervous system
- d) Peripheral nervous system
  Answer: b) Somatic nervous system