You can’t see them but they are inside us…
An alveolus (plural: alveoli, from Latin alveolus, “little cavity”) is an anatomical structure that has the form of a hollow cavity. Found in the lung, the pulmonary alveoli are spherical outcroppings of the respiratory bronchioles and are the primary sites of gas exchange with the blood. Alveoli are particular to mammalian lungs. Different structures are involved in gas exchange in other vertebrates.
(Blood Cells) Blood is a specialized bodily fluid that delivers necessary substances to the body’s cells — such as nutrients and oxygen — and transports waste products away from those same cells.
Clot of Blood
Zoomed Damaged Hair
Hair is a protein filament that grows through the epidermis from follicles deep within the dermis. The fine, soft hair found on many nonhuman mammals is typically called fur; wool is the characteristically curly hair found on sheep and goats. Found exclusively in mammals, hair is one of the defining characteristics of the mammalian class.
6 Days old Embryo (Fetus)
An embryo (The proper Latinate form would be embryum) is a multicellular diploid eukaryote in its earliest stage of development, from the time of first cell division until birth, hatching, or germination. In humans, it is called an embryo until about eight weeks after fertilization (i.e. ten weeks LMP), and from then it is instead called a fetus.
Eyes – Optic Nerves
The optic nerve, also called cranial nerve II, transmits visual information from the retina to the brain.
Purkinje cells, or Purkinje neurons, are a class of GABAergic neurons located in the cerebellar cortex. They are named after their discoverer, Czech anatomist Jan Evangelista Purkyně.
These cells are some of the largest neurons in the human brain (Betz cells being the absolute largest), with an intricately elaborate dendritic arbor, characterized by a large number of dendritic spines.
Fertilization – Sperm on Egg
Fertilisation (also known as conception, fecundation and syngamy), is the fusion of gametes to produce a new organism. In animals, the process involves a sperm fusing with an ovum, which eventually leads to the development of an embryo. Human fertilization is the union of a human egg and sperm, usually occurring in the ampulla of the fallopian tube. It is also the initiation of prenatal development.
Tongue Taste Receptor
Taste buds are small structures on the upper surface of the tongue, soft palate, upper esophagus and epiglottis that provide information about the taste of food being eaten. These structures are involved in detecting the five elements of taste perception: salty, sour, bitter, sweet, and umami (or savory). Via small openings in the tongue epithelium, called taste pores, parts of the food dissolved in saliva come into contact with the taste receptors. These are located on top of the taste receptor cells that constitute the taste buds. The taste receptor cells send information detected by clusters of various receptors and ion channels to the gustatory areas of the brain via the seventh, ninth and tenth cranial nerves. The human tongue has about 10,000 taste buds.
Calculus (dental) Tooth Stone
In dentistry, calculus is a form of hardened Dental plaque and is synonymous with tartar. It is caused by the continual accumulation of minerals from saliva on plaque on the teeth. Its rough surface provides an ideal medium for further plaque formation, threatening the health of the gingiva.
Brushing and flossing can remove plaque from which calculus forms; however, once formed, it is too hard and firmly attached to be removed with a toothbrush. Routine dental visits are necessary so that calculus buildup can be professionally removed with ultrasonic tools and specialized sharp instruments.
Small Intestine Fringes
In vertebrates, the small intestine is the part of the gastrointestinal tract (gut) following the stomach and followed by the large intestine, and is where the vast majority of digestion and absorption of food takes place. In invertebrates such as worms, the terms “gastrointestinal tract” and “large intestine” are often used to describe the entire intestine.
Human Ova (Ovum)
The ovum is one of the largest cells in the human body, typically visible to the naked eye without the aid of a microscope or other magnification device. The human ovum measures between 100 and 200 µm in diameter, while a more accurate measure would be 120 µm.
In the viviparous animals (which include humans and all other placental mammals), the ovum is fertilized inside the female body, and the embryo then develops inside the uterus, receiving nutrition directly from the mother.