Human Anatomy MCQs

Correct Answer: Skin

The skin is the largest organ of the human body, covering about 2 square metres in an adult.

Correct Answer: Liver

The liver is the largest internal organ of the human body, weighing about 1.5 kg in an adult.

Correct Answer: Stapes (ear bone)

The stapes, one of the three tiny ossicles of the middle ear, is the smallest bone in the human body, about 3 mm long.

Correct Answer: Femur (thigh bone)

The femur, the thigh bone, is the longest and strongest bone in the human body.

Correct Answer: 206

The adult human skeleton normally has 206 bones.

Correct Answer: 270

A newborn baby has about 270 bones; many are separate pieces of cartilage that fuse as the child grows, leaving 206 in the adult.

Correct Answer: 24 (12 pairs)

The human rib cage normally has 24 ribs, 12 pairs attached to the thoracic vertebrae.

Correct Answer: 33

The human spine has 33 vertebrae: 7 cervical, 12 thoracic, 5 lumbar, 5 sacral (fused) and 4 coccygeal (fused).

Correct Answer: 46 (23 pairs)

A normal human cell has 46 chromosomes in 23 pairs: 22 pairs of autosomes plus one pair of sex chromosomes.

Correct Answer: 22

The human skull has 22 bones: 8 cranial bones and 14 facial bones (excluding the 6 ear ossicles).

Correct Answer: Hinge

The elbow joint functions as a hinge joint, allowing for movement primarily in one plane (flexion and extension).

Correct Answer: Liver

The liver is the largest internal organ and the largest gland in the human body, performing over 500 vital functions.

Correct Answer: Eye

Rods and cones are specialized photoreceptor cells located in the retina of the human eye, responsible for vision in low light and color perception, respectively.

Correct Answer: Hamstring

The hamstring muscles are a group of three muscles located in the posterior compartment of the thigh.

Correct Answer: 120 torr

A normal systolic blood pressure reading for a healthy adult is typically around 120 mmHg (torr).

Correct Answer: Brachial artery

The standard medical practice for measuring blood pressure is to place the cuff over the brachial artery in the upper arm.

Correct Answer: 1 million

A normal human kidney contains approximately 1 to 1.5 million functioning units called nephrons.

Correct Answer: 6 liters

The total lung capacity of an average adult human male is about 6 liters of air.

Correct Answer: Femur

The femur, or thigh bone, is the longest and strongest bone in the human anatomy.

Correct Answer: 70-80 times

A normal resting heart rate for adults ranges from 60 to 100 beats per minute, commonly averaging between 70 and 80 beats.

Correct Answer: Red Blood Cells

Red Blood Cells contain hemoglobin, which binds to oxygen and transports it throughout the human body.

Correct Answer: 6 liters

The total lung capacity (TLC) of an average adult human male is approximately 6 liters of air.

Correct Answer: 120/80

A normal blood pressure reading for a healthy adult is typically around or less than 120 systolic over 80 diastolic mm Hg.

Correct Answer: Calcium

Calcium is the most abundant mineral in the human body, vital for bone health, muscle function, and nerve signaling.

Correct Answer: Cornea

The cornea is the transparent front part of the eye that is transplanted in corneal keratoplasty to restore vision.

Correct Answer: Small Intestine

The small intestine is composed of three main parts: the duodenum, the jejunum, and the ileum.

Correct Answer: 206

A typical adult human skeleton consists of exactly 206 bones, varying slightly in rare anatomical cases.

Correct Answer: Eyesight

Myopia, or nearsightedness, is a common vision condition affecting the eyes where close objects appear clearly, but far ones don't.

Correct Answer: None of these

Blood group O-negative is known as the universal donor type because it lacks A, B, and Rh antigens.

Correct Answer: 5-6 liters

The average adult human body contains approximately 5 to 6 liters of blood.

Correct Answer: Cerebrum

The cerebrum is the largest part of the brain, responsible for higher functions like thought, action, and emotion.

Correct Answer: Vitamin D

The human body naturally synthesizes Vitamin D when the skin is directly exposed to ultraviolet B (UVB) rays from sunlight.

Correct Answer: Eyelid

Eyelids are highly functional organs that protect and moisturize the eyes, unlike the coccyx (tailbone) or appendix, which are generally considered vestigial.

Correct Answer: 17-30

Wisdom teeth, or third molars, typically emerge in the back of the mouth between the late teens and late twenties.

Correct Answer: 120

Human red blood cells (erythrocytes) have an average lifespan of about 100 to 120 days before they are removed by the spleen and liver.

Correct Answer: 206

The typical adult human skeletal system consists of 206 bones, though babies are born with more that fuse as they grow.

Correct Answer: Kidney

The kidneys are the primary organs that filter waste products, excess water, and other impurities from the blood.

Correct Answer: 49 ounce

An adult male brain weighs approximately 1370 grams, which is roughly 48 to 49 ounces.

Correct Answer: 206

The skeletal system of a typical adult human is made up of exactly 206 bones.

Correct Answer: Hypothalamus

The hypothalamus acts as the body's thermostat, regulating body temperature, hunger, and other homeostatic systems.

Correct Answer: 206

The adult human skeletal system consists of exactly 206 bones, though humans are born with around 300.

Correct Answer: Liver

Bile is a digestive fluid produced continuously by the liver and stored in the gallbladder.

Correct Answer: Bi-Convex

The human eye has a natural crystalline bi-convex lens that changes shape to help focus light on the retina.

Correct Answer: Digestive

The gallbladder is a small organ located under the liver that stores bile to aid the digestive system in breaking down fats.

Correct Answer: Thymus

The thymus gland is largest and most active during childhood, but it gradually shrinks and is replaced by fat tissues after puberty.

Correct Answer: Types of teeth

These are the four main types of teeth in human anatomy, each serving a different function in chewing food.

Correct Answer: 206

While human infants are born with around 270 bones, many fuse together during growth, leaving the typical human adult skeleton with 206 bones.

Correct Answer: Phosphorus

Phosphorus is a crucial mineral in the body; about 85% of it is bound with calcium in bones and teeth, making up a significant portion of skeletal weight.

Correct Answer: Glucose

The brain relies almost exclusively on glucose as its primary source of energy to function properly.

Correct Answer: Femur

The femur, or thigh bone, is structurally designed to support the entire weight of the body and is the longest and strongest bone.

Correct Answer: Prolactin

Prolactin is a hormone produced in the pituitary gland that is primarily responsible for milk production (lactation) in mammals.

Correct Answer: Neuron

Neurons, also known as nerve cells, are the fundamental structural and functional units of the nervous system.

Correct Answer: Shoulder Bone

In anatomy, the scapula, or shoulder blade, is the bone that connects the humerus (upper arm bone) with the clavicle (collar bone).

Correct Answer: 4

The human heart has four chambers: two upper atria and two lower ventricles.

Correct Answer: Bone Marrow

Red blood cells are produced in the soft tissue inside our bones known as the bone marrow through a process called erythropoiesis.

Correct Answer: 22,000 times

A healthy adult takes about 12-20 breaths per minute, which averages roughly 22,000 breaths in a 24-hour period.

Correct Answer: Brain

The medulla oblongata forms the lowest part of the brainstem, controlling autonomic functions like breathing and heart rate.

Correct Answer: To remove waste products from the body

Kidneys filter blood to remove waste products and excess fluid, converting them into urine.

Correct Answer: Pancreas

Diabetes develops when the pancreas fails to produce enough insulin or when the body cannot effectively use the insulin it produces.

Correct Answer: Secretion of hormones

While bones do release minor hormones like osteocalcin, hormone secretion is primarily the function of the endocrine glands.

Correct Answer: Pancreas

Insulin is a hormone secreted by the beta cells of the islets of Langerhans in the pancreas to regulate blood glucose levels.

Correct Answer: Mouth

Digestion begins in the mouth, where mechanical chewing and salivary enzymes start breaking down carbohydrates.

Correct Answer: Liver

Bile is a digestive fluid produced by the liver and stored in the gallbladder until needed for digestion.

Correct Answer: Hydrochloric Acid

The human stomach naturally produces Hydrochloric Acid (HCl) to aid in the breaking down and digestion of food.

Correct Answer: Throat

The trachea, commonly known as the windpipe, connects the larynx to the bronchi, acting as the main airway to the lungs in the throat area.

Correct Answer: Respiratory System

The diaphragm sits directly beneath the lungs and plays the central role in breathing by contracting and expanding the chest cavity.

Correct Answer: 120 days

Red blood cells circulate in the human bloodstream for an average of 120 days before being destroyed and recycled by macrophages in the spleen and liver.

Correct Answer: 73%

Scientific estimates, such as those by the U.S. Geological Survey (USGS), state that the human brain and heart are composed of about 73% water.

Correct Answer: Ureter

The ureters are two thin, muscular tubes that carry urine from the renal pelvis of the kidneys down into the urinary bladder.

Correct Answer: Duodenum

The pancreas secretes digestive enzymes and bicarbonate into the duodenum, the first part of the small intestine, to neutralize stomach acid and break down food.

Correct Answer: Small intestine

Villi line the interior walls of the small intestine, vastly increasing its surface area to maximize the absorption of digested nutrients into the bloodstream.

Correct Answer: Chewing

Mastication is the physiological process of crushing and grinding food with teeth in the oral cavity to prepare it for swallowing and digestion.

Correct Answer: Bright Red

When hemoglobin in red blood cells binds with oxygen in the lungs, it forms oxyhemoglobin, which gives arterial blood its characteristic bright red color.

Correct Answer: 12

A typical human rib cage consists of 24 ribs in total, arranged uniformly into 12 pairs.

Correct Answer: 5 liters

The average adult body contains roughly 1.2 to 1.5 gallons (about 4.5 to 5.5 liters) of blood, making up about 10% of total body weight.

Correct Answer: Thoracic cavity

The lungs lie in the thoracic cavity of the chest.