Explanation

Submandible refers to the area under the lower jaw (mandible).

It is close to the ear region.

It contains submandibular glands, which are salivary glands.

Explanation

Flat bones are found in areas like the skull and ribs.

They providing protection and surface for muscle attachment.

They are thin and flattened compared to other bone types.

Explanation

Hydrochloric acid (HCl) is secreted by the stomach lining.

It activates pepsinogen into pepsin, an enzyme that digests proteins.

HCl also kills harmful bacteria in food and creates an acidic environment.

Proper protein digestion is essential for amino acid absorption in the small intestine.

Explanation

The medulla oblongata is located in the brainstem.

It regulates involuntary functions such as heartbeat, breathing, and blood pressure.

The cardiac center within the medulla controls heart rate and force of contraction.

It receives signals from the autonomic nervous system (sympathetic and parasympathetic).

Explanation

Blood circulation rate in human arteries varies, fastest in the aorta (around 30-40 cm/s) 

In capillaries, the speed drops significantly to allow nutrient and gas exchange.

Blood velocity is highest in arteries, moderate in veins, and slowest in capillaries.

Proper circulation speed ensures efficient delivery of oxygen and nutrients throughout the body.

Explanation

Chromosomes are thread-like structures found in the nucleus of a cell.

They carry genetic information in the form of DNA.

Humans have 46 chromosomes (23 pairs) in each cell.

Chromosomes determine hereditary traits passed from parents to offspring.

They play a key role in cell division, growth, and reproduction.

Explanation

A pacemaker is a small device implanted in the chest.

Its main function is to regulate the heartbeat.

Explanation

The vitamins not stored in the human body are Vitamin C and most B-complex vitamins

 Because they dissolve in water, the kidneys filter out what isn't immediately used, preventing buildup and toxicity but necessitating daily replenishment. 

Vitamin C (Ascorbic Acid): Essential for collagen and immune function, but any surplus is flushed out. 

B Vitamins (except B12): Includes Thiamin (B1), Riboflavin (B2), Niacin (B3), Pantothenic Acid (B5), Pyridoxine (B6), Biotin (B7), and Folate (B9). 

Explanation

300 grams is the weight of the heart of an adult human being.

The average gross weight of the heart was  for men 289.6 g

The average gross weight of the heart was  for women 284.7 

At the age of 61-70 years, the average weight of men was 345.9

At the age of 61-70 years, the average weight of women was 285.1

*****ٓAdditional Informations*****

A human brain weight is 1400 grams.

Explanation

جب کوئی انسان جگر میں سوجن کا شکار ہوجائے تو اس بیماری کو ہیپاٹیٹس کہا جاتا ہے۔

One person in every 30 seconds die due to Hepatitis in the world.