Biology — Human Body

The cerebellum acts as the control center for fine motor movements, balance, and posture.

Salivary and pancreatic amylase convert complex carbohydrates like starch into simpler sugars.

AB positive blood lacks A and B antibodies, meaning it can receive blood from any ABO type.

Thyroxine contains iodine atoms; a deficiency in iodine leads to the enlargement of the thyroid gland (goitre).

Vitamin K is essential for the production of several proteins that are required for blood clotting.

The pituitary gland secretes hormones that control the activity of other endocrine glands.

Nephrons are the structural and functional units of the kidney responsible for filtering blood and forming urine.

The femur (thigh bone) is the longest and strongest bone in the human skeleton.

There are 31 pairs of spinal nerves that emerge from the spinal cord segments.

Arteries carry oxygen-rich blood away from the heart (with the exception of the pulmonary artery).

Hemoglobin is an iron-containing protein in red blood cells that binds to oxygen and gives blood its red color.

The liver is the largest internal organ, while the skin is the largest organ overall.

Fertilization typically takes place in the ampulla of the fallopian tube (oviduct).

Alveoli are tiny air sacs where oxygen enters the blood and carbon dioxide leaves it.

The iris is the colored part of the eye that regulates the diameter of the pupil.

The beta cells of the Islets of Langerhans in the pancreas secrete insulin.

The pivot joint allows for rotational movement, such as turning the head from side to side.

Human blood is slightly alkaline, with a tightly regulated pH range of 7.35 to 7.45.

Collagen is the primary structural protein found in connective tissues, skin, and bones.

The larynx, also known as the voice box, contains the vocal cords that vibrate to produce sound.

Ligaments are tough, fibrous connective tissues that attach bone to bone, whereas tendons attach muscle to bone.

The left ventricle has the thickest muscular walls because it must generate enough pressure to pump oxygen-rich blood throughout the systemic circulation.

Vitamin K is produced by gut microflora and is crucial for the synthesis of prothrombin and other coagulation factors in the liver.

The Eustachian tube connects the middle ear to the nasopharynx and helps maintain equal atmospheric pressure on either side of the tympanic membrane.

The hypothalamus links the nervous system to the endocrine system via the pituitary gland by producing releasing and inhibiting hormones.

The liver produces bile, which emulsifies fats; the gallbladder merely stores and concentrates the bile until it is needed.

Lymphocytes are a type of white blood cell that play a central role in the adaptive immune system, specifically in the production of antibodies.

The patella is the triangular bone located at the front of the knee joint, commonly referred to as the kneecap.

Adrenaline (or epinephrine) is secreted by the adrenal medulla and prepares the body for rapid action during emergency conditions.

The cornea is the transparent front part of the eye that covers the iris and pupil; it is avascular and can be transplanted without significant risk of rejection.

The liver converts toxic ammonia (resulting from protein metabolism) into urea, which is then excreted by the kidneys.

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

The suprachiasmatic nucleus (SCN), located in the hypothalamus, regulates the circadian rhythm by responding to light and dark cues.

Lysozyme is an antimicrobial enzyme present in saliva, tears, and mucus that breaks down the peptidoglycan cell walls of bacteria.

Platelets, also known as thrombocytes, are small cell fragments that aggregate to form a plug at the site of a blood vessel injury.

Hemoglobin is an iron-containing protein in red blood cells that binds to oxygen in the lungs and transports it to tissues throughout the body.

The cranium is the bony structure that encloses and protects the brain from physical injury.

Alveoli are tiny, grape-like air sacs in the lungs where the exchange of oxygen and carbon dioxide takes place via diffusion.

Myopia, or nearsightedness, occurs when the image of a distant object focuses in front of the retina rather than directly on it.

The kidneys filter blood to remove waste products like urea, excess salts, and water, which are then excreted as urine.

The Olfactory nerve (Cranial Nerve I) is the first and shortest cranial nerve and is responsible for the special sense of smell.

The dermis is the middle layer of the skin which contains connective tissue, hair follicles, sweat glands, and oil glands.

The clavicle, commonly known as the collarbone, is a long bone that serves as a strut between the shoulder blade and the sternum.

Bile salts produced by the liver and stored in the gallbladder break large fat globules into smaller droplets, increasing the surface area for lipase action.

The myelin sheath is an insulating layer around nerves that allows electrical impulses to transmit quickly and efficiently along the nerve cells.

The corpus luteum is a temporary endocrine structure that develops from the ovarian follicle after ovulation and secretes progesterone to maintain pregnancy.

The left ventricle has the thickest walls because it must generate enough pressure to pump oxygenated blood to the entire body.

Calcium is the most abundant mineral in the human body, critical for structural support of the skeletal system and essential for muscle contraction.

Red blood cells circulate in the body for approximately 120 days before being recycled by the spleen and liver.

The cochlea contains the organ of Corti, which converts mechanical sound vibrations into electrical nerve impulses.