1. : Which of the following is the primary function of red blood cells?
(A) Immune defense
(B) Oxygen transport
(C) Blood clotting
(D) Hormone transport
2. : What type of muscle is found in the walls of the heart?
(A) Skeletal muscle
(B) Smooth muscle
(C) Cardiac muscle
(D) Voluntary muscle
3. : Which organ in mammals is responsible for filtering blood and producing urine?
(A) Liver
(B) Stomach
(C) Kidney
(D) Spleen
4. : What is the main structural component of the animal cell membrane?
(A) Proteins
(B) Lipids
(C) Carbohydrates
(D) Nucleic acids
5. : In which part of the digestive system does most nutrient absorption occur?
(A) Stomach
(B) Small intestine
(C) Large intestine
(D) Esophagus
6. : Which system in the body is responsible for coordinating voluntary and involuntary actions?
(A) Circulatory system
(B) Endocrine system
(C) Nervous system
(D) Digestive system
7. : Which of the following is the primary function of the liver?
(A) Oxygen exchange
(B) Protein synthesis
(C) Detoxification
(D) Nutrient absorption
8. : What is the main function of the diaphragm in mammals?
(A) Circulation
(B) Breathing
(C) Digestion
(D) Excretion
9. : Which blood vessels carry blood away from the heart?
(A) Veins
(B) Capillaries
(C) Arteries
(D) Lymphatics
10. : Which structure in the animal brain controls balance and coordination?
(A) Cerebrum
(B) Cerebellum
(C) Medulla
(D) Hypothalamus
11. : What is the primary function of the large intestine in the digestive system?
(A) Digest proteins
(B) Absorb water
(C) Break down fats
(D) Produce bile
12. : Which type of blood cell is primarily involved in the immune response?
(A) Red blood cells
(B) Platelets
(C) White blood cells
(D) Plasma cells
13. : What type of joint is found in the shoulder and hip, allowing for a wide range of motion?
(A) Hinge joint
(B) Ball-and-socket joint
(C) Pivot joint
(D) Saddle joint
14. : Which organ is responsible for the production of insulin in mammals?
(A) Liver
(B) Stomach
(C) Pancreas
(D) Spleen
15. : What is the main function of platelets in the blood?
(A) Transport oxygen
(B) Clot blood
(C) Fight infections
(D) Transport nutrients
16. : Which part of the neuron is responsible for transmitting signals to other neurons or muscles?
(A) Dendrites
(B) Axon
(C) Cell body
(D) Nucleus
17. : What type of tissue connects muscle to bone?
(A) Tendons
(B) Ligaments
(C) Cartilage
(D) Fascia
18. : Which hormone regulates the body’s metabolism and is produced by the thyroid gland?
(A) Insulin
(B) Adrenaline
(C) Thyroxine
(D) Estrogen
19. : Which chamber of the heart pumps oxygenated blood to the body?
(A) Right atrium
(B) Right ventricle
(C) Left atrium
(D) Left ventricle
20. : Which part of the respiratory system is responsible for gas exchange?
(A) Bronchi
(B) Trachea
(C) Alveoli
(D) Larynx
21. : What is the role of hemoglobin in red blood cells?
(A) Clotting blood
(B) Transporting oxygen
(C) Breaking down glucose
(D) Fighting infection
22. : Which muscle type is voluntary and striated?
(A) Cardiac muscle
(B) Skeletal muscle
(C) Smooth muscle
(D) None of the above
23. : Which part of the animal’s eye regulates the amount of light entering the eye?
(A) Lens
(B) Retina
(C) Pupil
(D) Cornea
24. : What is the functional unit of the kidney called?
(A) Neuron
(B) Nephron
(C) Alveolus
(D) Osteon
25. : Which hormone is primarily responsible for regulating blood sugar levels?
(A) Adrenaline
(B) Glucagon
(C) Insulin
(D) Thyroxine
26. : What type of skeleton do insects have?
(A) Endoskeleton
(B) Exoskeleton
(C) Hydrostatic skeleton
(D) None of the above
27. : Which of the following organs is part of both the respiratory and digestive systems?
(A) Esophagus
(B) Trachea
(C) Pharynx
(D) Diaphragm
28. : Which structure in the ear is responsible for maintaining balance?
(A) Cochlea
(B) Auditory canal
(C) Semicircular canals
(D) Eardrum
29. : What is the primary function of the spleen in the immune system?
(A) Producing red blood cells
(B) Filtering blood and fighting infections
(C) Producing antibodies
(D) Regulating hormones
30. : Which organ system is responsible for producing hormones?
(A) Nervous system
(B) Circulatory system
(C) Endocrine system
(D) Excretory system