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$Small intestine. Coloured scanning electron micrograph (SEM) of a freeze-fractured of the small intestine. The surface consists of deep folds, called villi. The intestinal surface( pink) is exposed to food — Stock Photo$

Small intestine. Coloured scanning electron micrograph (SEM) of a freeze-fractured of the small intestine. The surface consists of deep folds, called villi. The intestinal surface( pink) is exposed to food

Computer illustration of the basal ganglia, showing caudate nucleus (green), putamen (yellow), and lateral ventricles (blue).

Blond waitress wearing face mask working in a cafe.

Human smooth muscle, light micrograph. Haematoxylin and eosin stain.

Stomach lining. Coloured scanning electron micrograph (SEM) of the glandular lining (mucosa) of the stomach. The gastric mucosa secretes the digestive enzymes and hydrochloric acid

Human eye nerve, light micrograph. Haematoxylin and eosin stain.

Mitochondria cross-section, illustration. Mitochondria are organelles found in the cytoplasm of eukaryotic cells. They oxidise sugars and fats to produce energy in a process called cellular respiration

Stomach lining. Coloured scanning electron micrograph (SEM) of the glandular lining (mucosa) of the stomach. The gastric mucosa secretes the digestive enzymes and hydrochloric acid

Tendon, coloured scanning electron micrograph (SEM), showing bundles of collagen fibres. The parallel alignment of the fibres make tendons inelastic but flexible. Tendons attach muscle to bone

Hair follicles. Coloured scanning electron micrograph (SEM). The outer layer of hair (the cuticle) has overlapping scales of keratin. These scales are thought to prevent hairs from matting together

Light micrograph of a colon biopsy from a colonoscopy. The pathology report describes normal colonic mucosa fragment with colic glands. Haematoxylin and eosin stain.

$Intestinal lining. Coloured scanning electron micrograph (SEM) of a freeze-fractured of the small intestine. The surface consists of deep folds, called villi. The intestinal surface( yellow) is exposed to food — Stock Photo$

Intestinal lining. Coloured scanning electron micrograph (SEM) of a freeze-fractured of the small intestine. The surface consists of deep folds, called villi. The intestinal surface( yellow) is exposed to food

Male barista wearing black baseball cap and face mask working behind counter.

Human brain with highlighted corpus callosum, also known as callosal commissure, illustration. It is a wide, thick nerve tract connecting the left and right cerebral hemispheres.

Woman training and stretching indoors

Amygdala of the brain, illustration. The amygdala (red) is part of the brain's limbic system and plays a key role in processing emotions.

Blond waitress wearing face mask working in a cafe.

Male hairstylist in eyeglasses making haircut to adult client in hairdressing salon during COVID 19 pandemic

Illustration of the amygdala in the brain, and a close-up view of its neurons. The amygdala (red) is part of the brain's limbic system and plays a key role in processing emotions.

Stylish young female friends in casual clothes and protective masks walking on city street after shopping in grocery during COVID pandemic

Male hairdresser with mirror showing haircut to client in cloth face mask while looking forward in barbershop during COVID 19 pandemic

Female medical specialist in protective uniform, latex gloves and face mask doing mouth swab test with cotton bud on African American female patient in clinic during coronavirus outbreak

From above of crop anonymous hairdresser with tattoos washing hair of man with shampoo in washbasin in barbershop

$Female doctor in latex gloves and face shield standing with chemical liquid in glass vial preparing to vaccinate patient in clinic during coronavirus outbreak — Stock Photo$

Female doctor in latex gloves and face shield standing with chemical liquid in glass vial preparing to vaccinate patient in clinic during coronavirus outbreak

Male stylist in textile mask spraying haircut of client with liquid from bottle in barbershop

Crop unrecognizable male surgeon with female coworkers in uniforms greeting each other with elbow bump at work in hospital

Cheerful female medical specialist in protective uniform, latex gloves and face mask talking to African American female patient before vaccinating in clinic during coronavirus outbreak

Stylish young female friends in casual clothes and protective masks walking on city street after shopping in grocery during COVID pandemic

Female medical specialist in protective uniform, latex gloves and face mask doing nasal swab test with cotton bud on African American female patient in clinic during coronavirus outbreak

Male hairstylist in eyeglasses making haircut to adult client in hairdressing salon during COVID 19 pandemic

Cheerful female medical specialist in protective uniform, latex gloves and face mask talking to African American female patient before vaccinating in clinic during coronavirus outbreak

Male hairstylist in eyeglasses making haircut to adult client in hairdressing salon during COVID 19 pandemic

Unrecognizable female medical specialist in protective uniform, latex gloves and face mask vaccinating African American female patient in clinic during coronavirus outbreak

Cropped unrecognizable female medical specialist in protective uniform and latex gloves vaccinating anonymous African American female patient in clinic during coronavirus outbreak

Male hairstylist in eyeglasses making haircut to adult client in hairdressing salon during COVID 19 pandemic

Calm young African American female in warm jacket and protective face mask browsing mobile phone while standing on hilltop against blurred city in twilight

Multiracial female athletes in disposable masks squatting against rough post while looking away during workout in urban park

Male hairdresser in cloth face mask with brush removing hair from cape of client in barbershop

Female medical specialist in protective uniform, latex gloves and face mask doing nasal swab test with cotton bud on African American female patient in clinic during coronavirus outbreak

Content best female friends in ornamental dresses and cloth face masks touching elbows while looking at each other in town during coronavirus pandemic

From above of crop anonymous hairdresser with tattoos washing hair of man with shampoo in washbasin in barbershop

Male hairstylist in eyeglasses making haircut to adult client in hairdressing salon during COVID 19 pandemic

Female medical specialist in protective uniform, latex gloves and face mask vaccinating African American female patient in clinic during coronavirus outbreak

Male stylist trimming wet hair of crop anonymous client with scissors in hairdressing salon on blurred background

From below of crop stylist with trimmer cutting hair of man in cloth face mask with cellphone in barbershop

Company of female travelers with backpacks and in protective masks hiking in highlands in summer

Male hairstylist in eyewear touching hair of client in fabric mask while looking forward in barbershop

Substantia nigra. Illustration showing a healthy substantia nigra in a human brain. The substantia nigra plays an important role in reward, addiction, and movement. Degeneration of this structure is characteristic of Parkinson's disease.

Side view contemplative African American female in warm jacket and face mask standing on verdant hilltop and observing modern city in twilight

Female medical specialist in protective uniform, latex gloves and face mask vaccinating happy African American female patient in clinic during coronavirus outbreak

Cropped unrecognizable female medical specialist in protective uniform and latex gloves vaccinating anonymous African American female patient in clinic during coronavirus outbreak

Boy sitting at a table doing his homework

Three young children working on an art project at home

From below of crop stylist with trimmer cutting hair of man in cloth face mask with cellphone in barbershop

From above of crop medic in uniform with syringe vaccinating senior woman in mask during coronavirus pandemic in clinic

$Female doctor in latex gloves and face shield filling in syringe from bottle with vaccine preparing to vaccinate patient in clinic during coronavirus outbreak — Stock Photo$

Female doctor in latex gloves and face shield filling in syringe from bottle with vaccine preparing to vaccinate patient in clinic during coronavirus outbreak

Male hairdresser in textile mask trimming hair of anonymous client in armchair against mirror in barbershop

Female tattooer in cloth face mask with machine drawing tattoo on body of unrecognizable client in salon

Three young children working on an art project at home

Content best female friends in casual wear with hot drinks in tumblers having conversation while looking at each other in town