Free Human Body and Health MCQs with Answers

21. The shape of the external ear is due to____________?

• A. Elastic cartilage
• B. Fibrocartilage
• C. Articular cartilage
• D. none

Explanation: The external ear, or pinna, is shaped and supported mainly by elastic cartilage, which bends and returns to its original form. Fibrocartilage is tougher and occurs in structures such as intervertebral discs.

22. When a patient's immune system becomes reactive to a drug, this is an example of?

• A. Super infection
• B. Drug resistance
• C. Allergy
• D. none

Explanation: An immune reaction to a drug is a drug allergy, an adverse response involving the immune system. Drug resistance means a microorganism or cancer cell no longer responds effectively to treatment.

23. Which of these is not a region of the spinal cord?

• A. Thoracic
• B. Pelvic
• C. Lumbar
• D. none

Explanation: The spinal cord is divided into cervical, thoracic, lumbar, sacral, and coccygeal regions; pelvic is not one of them. The pelvis is a body region, not a spinal-cord division.

24. The autonomic nervous system innervates all of these except?

• A. Cardiac muscles
• B. Skeletal muscles
• C. Smooth muscles
• D. none

Explanation: The autonomic nervous system controls involuntary cardiac and smooth muscles, along with glands and internal organs. Skeletal muscles are controlled mainly by the somatic nervous system.

25. The damage to the_________nerve could result in the defect of the eye movement:

• A. Optic
• B. Trigeminal
• C. Abducens
• D. none

Explanation: The abducens nerve controls the lateral rectus muscle, which moves the eye outward. Damage to it causes difficulty moving the affected eye laterally, unlike the optic nerve, which mainly carries visual signals.

26. Serum if blood plasma minus its?

• A. Calcium ions
• B. Clotting proteins
• C. Globulins
• D. none

Explanation: Serum is the liquid left after blood has clotted, so it is plasma without most clotting proteins, especially fibrinogen. Globulins and calcium ions remain present in serum.

27. Which of the following is not an enzyme?

• A. Chemotrypsin
• B. Secretin
• C. Pepsin
• D. none

Explanation: Secretin is a digestive hormone released by the small intestine, not an enzyme. Chymotrypsin and pepsin are protein-digesting enzymes.

28. It is impossible for a type of O+ baby to have a type of____________mother:

• A. AB-
• B. O-
• C. O+
• D. none

Explanation: An O blood-group child must inherit an O allele from each parent, but an AB mother has only A and B alleles. The mother's Rh-negative status does not prevent an Rh-positive child, so AB- is the impossible option.

29. An area of microbiology that is concerned with the occurence of disease in human population is?

• A. Immunology
• B. Paracitology
• C. Epidemiology
• D. none

Explanation: Epidemiology studies the distribution, causes and control of diseases in human populations. Immunology concerns immune responses, while parasitology concerns parasites.

30. Anti Diuretic hormone is secreted by one of the following glands?

• A. Pituitary
• B. Pancreas
• C. Thyroid
• D. None

Explanation: ADH is made in the hypothalamus but stored and released by the posterior pituitary, so standard MCQs credit the pituitary gland. It helps the kidneys conserve water.