Mitochondria are often referred to as the 'powerhouses of the cell' as they produce energy in the form of adenosine triphosphate (ATP) through cellular respiration.

The respiratory system is responsible for the exchange of oxygen and carbon dioxide between the body and the environment through the processes of inhalation and exhalation.

Insulin is a hormone produced by the pancreas that helps control blood sugar levels by promoting the uptake of glucose from the blood into cells.

The skin is the largest organ in the human body, covering the entire surface and serving as a protective barrier, regulating body temperature, and facilitating sensory perception.

The aorta is the main artery that carries oxygenated blood away from the heart to various parts of the body.

The lymphatic system is a network of vessels and nodes that helps drain excess fluid and waste from tissues, as well as plays a role in the immune response.

Vitamin D is essential for the absorption of calcium from the digestive tract, which is crucial for maintaining strong bones and teeth.

The kidneys are responsible for filtering waste products and excess water from the blood, producing urine as a means of elimination.

Thyroid hormone plays a crucial role in regulating growth and development, as well as metabolism and energy expenditure.

The nervous system is responsible for communication and coordination between different parts of the body, enabling sensory perception, motor control, and cognitive functions.

The liver produces bile, a fluid that aids in the digestion and absorption of fats in the small intestine.

The immune system protects the body against harmful microorganisms, such as bacteria, viruses, and fungi, through various mechanisms.

Vitamin C is essential for the prevention of scurvy, a disease caused by a deficiency of vitamin C, which leads to impaired wound healing and weakened immune function.

The endocrine system regulates various bodily functions through the secretion of hormones, which are chemical messengers that travel through the bloodstream to target cells.

The pancreas produces insulin, a hormone that helps regulate blood sugar levels by promoting the uptake of glucose from the blood into cells.