Permanent and Deciduous TeethN
Posted inDental

Permanent and Deciduous TeethN

Humans have two sets of teeth: deciduous starting eruption around 6 months with 20 total—8 incisors, 4 canines, 8 molars—for primary chewing until about age 12 when exfoliated, and permanent…
Digestion of Proteins Physiology
Posted inMedical

Digestion of Proteins Physiology

Digestion of proteins physiology involves not just enzymes but sophisticated regulation to match secretion to dietary intake, starting with the cephalic phase where sight or smell of food stimulates vagal…
Muscular and Elastic Artery Arteriole
Posted inMedical

Muscular and Elastic Artery Arteriole

Muscular arteries like femoral or radial distribute blood flow via thick tunica media of smooth muscle regulating resistance through vasoconstriction or dilation, elastic arteries like aorta buffer pulsatile flow with…
Hepatic Portal Vein System
Posted inOrgans

Hepatic Portal Vein System

The hepatic portal vein system is a unique venous network that collects nutrient-rich, deoxygenated blood from the gastrointestinal tract, pancreas, and spleen and delivers it directly to the liver for…
Vascular Homeostasis Flow Art
Posted inMedical

Vascular Homeostasis Flow Art

Vascular homeostasis maintains flow via autoregulation myogenic metabolic matching perfusion demand, endothelial nitric oxide prostacyclin vasodilation shear stress, endothelin angiotensin constriction, arteriolar tone dominant resistance site, capillary hydrostatic oncotic pressures…
FlowChart Veins into VenaCava
Posted inMedical

FlowChart Veins into VenaCava

Venous blood from the body converges into two great veins: the superior and inferior vena cava. Head and neck veins drain into the brachiocephalic veins, which merge into the superior…
IVF
Posted inWomen

IVF

In vitro fertilization bypasses natural barriers by retrieving mature eggs from stimulated ovaries, fertilizing with sperm in lab—sometimes via ICSI injection—culturing embryos to blastocyst, then transferring to prepared uterus, with…
Iliac Artery Branches Chart
Posted inMedical

Iliac Artery Branches Chart

The common iliac arteries branch from abdominal aorta bifurcation at L4, each dividing into external iliac supplying lower limb via femoral and internal iliac feeding pelvis. Internal branches include superior…
Histology of the Large IntestineN
Posted inOrgans

Histology of the Large IntestineN

The large intestine's histology is geared toward water absorption, electrolyte balance, and waste formation, with a mucosa lacking villi but featuring deep crypts of Lieberkühn lined by columnar absorptive cells…
Fetal Circulatory System
Posted inMedical

Fetal Circulatory System

The fetal circulatory system is beautifully adapted to bypass the lungs and liver while maximizing placental exchange. Blood leaves the fetus through two umbilical arteries branching from the iliac arteries,…
Structures of the Respiratory Zone
Posted inOrgans

Structures of the Respiratory Zone

Structures of respiratory zone begin distal terminal bronchioles with occasional alveoli respiratory bronchioles more leading alveolar ducts fully walled sacs clusters sharing openings millions thin-walled pouches type I cells diffusion…
Major Systemic Artery
Posted inMedical

Major Systemic Artery

Major systemic arteries begin with ascending aorta giving coronaries, arch branching brachiocephalic, left common carotid, left subclavian, then descending thoracic supplying intercostals, abdominal continuing as celiac, mesenteric, renal, gonadal, iliacs,…
Implantation
Posted inWomen

Implantation

Implantation occurs about a week after fertilization when the blastocyst, having hatched from zona pellucida, adheres to endometrial lining primed by progesterone, with trophoblast cells invading to establish placental connections.…
Varicose Vein
Posted inDisease

Varicose Vein

Varicose veins are dilated tortuous superficial veins usually lower limbs from valve incompetence allowing reflux pooling under gravity, great saphenous common, risk factors standing pregnancy obesity heredity, symptoms aching heaviness…
Lower Limb Arteries Chart
Posted inMedical

Lower Limb Arteries Chart

The arterial supply to lower limbs forms a continuous chain with branches providing redundancy, starting with common femoral dividing into superficial femoral through adductor canal and profunda femoris laterally, then…
Heart Musculature
Posted inMuscles

Heart Musculature

The heart's muscular wall, the myocardium, consists of specialized cardiac muscle cells arranged in spiral and circular bundles unique to each chamber. Atrial muscle is thinner and arranged in loops,…
Comparison of Artery and Vein
Posted inMedical

Comparison of Artery and Vein

A side-by-side vascular comparison highlights the structural differences between arteries and veins. Thick muscular walls, narrow lumens, and elastic layers are shown in arteries, while veins appear thinner with wider…
Stethoscope Placement
Posted inMedical

Stethoscope Placement

Stethoscope placement for heart sounds uses four standard sites: aortic second right intercostal sternal border high-pitched semilunar closures, pulmonic second left for same, tricuspid lower left sternal for right AV,…
Cooperation Between Innate and Immune Responses
Posted inMedical

Cooperation Between Innate and Immune Responses

An immune system interaction diagram illustrates how innate and adaptive responses work together. Early defenses such as macrophages and inflammation are shown activating and guiding lymphocytes. This cooperation explains faster…