Mr. Brain

The brain receives signals from the senses (sight, hearing, touch, etc.), analyzes them, and helps us perceive and understand the world around us. This also includes:
Memory is the ability to remember, store and reproduce information.
Attention is the ability to concentrate on a task while filtering out distractions.
Thinking – analysis, synthesis, comparison, generalization, decision making.
Speech is understanding and expressing thoughts in words.
Perception is the processing of visual, auditory, and tactile information.
Executive functions – planning, self-control, flexibility of thinking, ability to switch between tasks.

Mr. Brain has red hair, almost like blood. He has dark blue eyes and a perpetually upturned nose. He is very intelligent, cold, and if he sees a problem, he is unwilling to tolerate it. He condemns Mr. Heart for being too soft-hearted and easily amorous. The Brain believes that "love" is expensive, useless, and, if wrong, painful for Mr. Heart. Mr. Brain is the most important organ; all organs obey him. He loves glucose; it nourishes him.

Protective. The lungs serve as a barrier between the body's internal and external environments. The mucous membrane of the respiratory tract traps particles (dust, soot), and the cilia of the ciliated epithelium move mucus upward, removing foreign particles and microbes. Alveolar macrophages work within the alveoli themselves; they engulf and digest settled particles and pathogens. Furthermore, the lungs synthesize substances with protective functions: lysozyme (destroys bacterial cell membranes), interferon, lactoferrin (binds iron, essential for microbes), and immunoglobulins (particularly IgA, which neutralizes toxins and protects against infections). Microbes, fat cell aggregates, and small blood clots are trapped and destroyed in the pulmonary capillaries.
Participation in the regulation of acid-base balance. The lungs remove volatile acids (such as carbonic acid), helping to maintain a constant blood pH. Excess carbon dioxide leads to acidification, while its reduction leads to alkalization.
Endocrine (metabolic). The lungs are involved in the synthesis and inactivation of biologically active substances. For example, they convert angiotensin I into angiotensin II (a potent vasoconstrictor) via angiotensin-converting enzyme. The same enzyme also breaks down bradykinin. The lungs also inactivate most prostaglandins E and F. Heparin, histamine, serotonin, thromboplastin, and other substances are also synthesized here.
Excretory. Exhaled air eliminates not only carbon dioxide but also other volatile substances: water vapor (about 0.5 liters per day), ethanol, acetone, ether, and nitrous oxide.
Blood storage. The lungs can store up to 15% of the circulating blood volume.

Sister and brother, athletes, in pink shirts, for any movement.

Barrier (protective). In addition to detoxification, the liver protects the body through immune mechanisms. Stellate macrophages (Kupffer cells) in the liver phagocytize (engulf) microorganisms, their toxins, antigens, immune complexes, and dead blood cells. The liver also contains other immune cells (for example, NK cells).
Excretory (eliminatory). The liver is involved in the elimination of various substances from the body. For example, it excretes hemoglobin breakdown products (bilirubin): it captures indirect (unconjugated) bilirubin from the blood, binds it with glucuronic acid, and excretes it as direct (conjugated) bilirubin in bile. Bile also eliminates certain excess substances (medications, hormones, and neurotransmitters).
Homeostatic. Overall, the liver helps maintain a stable internal environment (homeostasis) by regulating all types of metabolism.
A quiet lady who mostly just does her job, dislikes alcohol and all sorts of nasty and harmful things. Brown hair.

Food storage. The stomach acts as a reservoir: after eating, its walls relax to accommodate the volume of food, then gradually mix it.
Mechanical processing. Muscular contractions (peristalsis) grind food, turning it into a semi-liquid mass—chyme.
Chemical processing. The glands of the mucous membrane produce gastric juice, which contains hydrochloric acid (which creates an acidic environment for enzymes to work, disinfecting food) and enzymes (for example, pepsin, which breaks down proteins).
Evacuation (evacuation) function. After processing, chyme passes in portions through the pyloric sphincter into the small intestine.
Protective function. The mucus barrier protects the stomach walls from the aggressive effects of acid and pepsin. Hydrochloric acid also has a bactericidal effect.
Endocrine (incretory) function. The stomach produces hormones (gastrin, histamine, etc.) that regulate digestion.
Absorption function. The stomach absorbs small amounts of water, mineral salts, and certain substances (glucose, alcohol, and certain medications).
Participation in hematopoiesis. The mucosal glands produce intrinsic factor, a protein necessary for the absorption of vitamin B12.
Excretory function. The stomach is involved in the elimination of metabolic products (urea, uric acid, etc.), as well as certain foreign substances (iodine, medications) from the body.

A hard worker, he loves to be spoiled with unhealthy treats, but hates spicy food.

Motor-evacuation (motor). It moves food through the digestive tract through wave-like contractions of the walls (peristalsis) and controls the release of contents.
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Secretory. The intestines produce mucus, which lubricates the contents and protects the walls, and also contains enzymes for chemical processing of food.
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Digestive (digestion). This process breaks down complex food components (proteins, fats, carbohydrates) into simple molecules (amino acids, monosaccharides, fatty acids). This is accomplished by enzymes produced by the intestines' own glands, as well as by the pancreas and bile from the liver.
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Absorption. The intestinal mucosa (especially the small intestine) has villi and microvilli, which greatly increase the surface area for absorption. Amino acids and sugars enter the bloodstream, and fatty acids enter the lymphatic vessels.
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Excretory. The intestines remove undigested food residues from the body, as well as certain metabolic products and potentially harmful substances (heavy metal salts, certain medications).
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Immune defense. The intestinal mucosa and lymphoid tissue (especially in the appendix) recognize and neutralize pathogenic microorganisms.
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Synthetic (in the large intestine). Beneficial bacteria in the large intestine synthesize certain vitamins (K and B vitamins), participate in the breakdown of fiber, and suppress the growth of harmful microorganisms.

2 twins, a girl and a boy, are quite lazy, can rebel against the orders of the Brain and create constipation, diarrhea, appendix and inflammation.