Human Physiology and Anatomy

Karl Landsteiner discovered the human blood groups in 1901, which was a groundbreaking discovery in medicine. The other options are known for different contributions: Edward Jenner for smallpox vaccine, William Harvey for circulation of blood, and 'Laren' is not a recognized figure in this context.

The adrenal gland produces hormones like adrenaline that are responsible for the body's fight-or-flight response, which is associated with heightened emotions such as fear and excitement.

Arthrology is the branch of science that studies joints, their structure, function, and diseases. The other options refer to different fields: Esthesiology relates to sensation, Splanchnology to internal organs, and Anthropology to human societies and cultures.

The calcaneus is the large bone forming the heel of the human foot, making option A the correct answer.

Red blood cells are produced in the bone marrow, which is the soft tissue inside bones responsible for hematopoiesis (blood cell formation). The other options do not produce red blood cells.

Anti Diuretic Hormone (ADH), also known as Vasopressin, is secreted by the posterior pituitary gland. It helps regulate water balance in the body by controlling the amount of water reabsorbed by the kidneys.

White blood cells (WBC) are called the 'soldiers' of the body because they defend against infections and foreign invaders, protecting the body from disease.

Anti Diuretic Hormone (ADH) is secreted by the posterior pituitary gland, which regulates water balance in the body by controlling the amount of water reabsorbed by the kidneys.

Food typically remains in the small intestine for about 2 to 6 hours, where most nutrient absorption occurs before moving to the large intestine.

The average weight of a human male brain is approximately 1350 grams, which is supported by anatomical studies. This makes option C the correct choice.

Fat digestion primarily occurs in the small intestine where bile from the liver emulsifies fats and pancreatic enzymes break them down for absorption.

The pupil of the eye does not grow in size after birth; it changes size temporarily to regulate light entry but its physical size remains constant. Other organs like the kidney and liver grow as the body grows.

Thrombosis is the formation of a blood clot inside a blood vessel, which can obstruct the flow of blood. This matches the description of 'clotting of blood vessels.'

Insulin lowers blood glucose levels by facilitating cellular uptake of glucose, whereas carbohydrates, cholesterol, and epinephrine can raise blood glucose levels. Therefore, insulin is the exception in this list.

The spleen is known as the 'graveyard of RBCs' because it is the primary organ where old and damaged red blood cells are removed and destroyed.

Leukaemia is a disease characterized by an abnormal and excessive increase in white blood cells (WBCs). This overproduction disrupts normal blood cell function, leading to various health problems. The other options do not involve increased WBCs.

The normal pH range of human blood is tightly regulated between 7.35 and 7.45, which is slightly alkaline. This range is essential for proper physiological functions. Options A, B, and D fall outside this normal range.

Aldosterone is a hormone produced by the adrenal glands that regulates sodium and potassium levels in the blood by promoting sodium retention and potassium excretion in the kidneys. Cortisol primarily regulates metabolism and stress response, glycogens are storage forms of glucose, and pheromones are chemical signals for communication, not involved in electrolyte balance.

Each human hand contains 27 bones: 8 carpal bones in the wrist, 5 metacarpal bones in the palm, and 14 phalanges in the fingers (3 in each finger and 2 in the thumb). This is confirmed by authoritative sources such as the National Institutes of Health and medical anatomy references. Therefore, the correct answer is 27 bones, which corresponds to option B.

The correct term for the framework made up of all the bones in the body is the 'skeleton'. It provides structure and support to the body.

The stomach is typically described as having a J shape, which resembles a bag-like structure that connects the esophagus to the small intestine.

The hypothalamus controls the pituitary gland by producing hormones that regulate its secretion, making it the key brain region responsible for pituitary function.

Saliva of a healthy human is slightly alkaline, typically with a pH around 6.5 to 7.5, which helps neutralize acids and maintain oral health.

Calcium levels in the blood are primarily regulated by the parathyroid glands through the secretion of parathyroid hormone (PTH). The thyroid gland influences calcium metabolism via calcitonin but plays a lesser role compared to the parathyroid. Therefore, the correct answer is Parathyroid.

Erythrocyte is the scientific term for red blood cells, which carry oxygen in the blood. Therefore, option C is correct.