Action Potential Heart Contraction
Posted inMuscles

Action Potential Heart Contraction

A heart physiology illustration linking action potentials to contraction demonstrates how electrical signals drive each heartbeat. It traces the spread of an action potential through cardiac muscle cells, beginning with…
Embryo Week 3
Posted inMedical

Embryo Week 3

Embryo week 3 is a pivotal period of gastrulation where the primitive streak appears on the epiblast, cells ingress to form mesoderm and definitive endoderm, displacing hypoblast, while the notochord…
Cardiac ConductionN
Posted inOrgans

Cardiac ConductionN

A cardiac conduction diagram maps the heartÂ’s electrical system from the sinoatrial node through the atrioventricular node and into the ventricles. It shows how timing and coordination ensure efficient contraction.…
DeglutitionN
Posted inMedical

DeglutitionN

Deglutition, more commonly known as swallowing, is a remarkably coordinated process that moves food or liquid from the mouth to the stomach in three distinct phases while protecting the airway…
Development of Lower Respiratory SystemN
Posted inOrgans

Development of Lower Respiratory SystemN

The development of the lower respiratory system begins early in embryonic life around week four when a respiratory diverticulum buds off the ventral foregut endoderm, separating from the esophagus and…
Occluded Coronay Arteries
Posted inDisease

Occluded Coronay Arteries

Occluded coronary arteries from atherosclerotic plaque rupture and thrombosis deprive downstream myocardium of oxygen, causing ischemia then infarction if prolonged, with left anterior descending affecting large anterior wall, right coronary…
Blood Flow in the Kidneys
Posted inOrgans

Blood Flow in the Kidneys

A detailed illustration of blood flow in the kidneys highlights how circulation supports filtration and waste removal. The diagram traces blood entering through the renal artery, branching into smaller vessels,…
Urine Color Chart
Posted inMedical

Urine Color Chart

Urine color normally pale straw yellow from urochrome pigment concentration, clear dilute dark concentrated dehydration, colorless overhydration diabetes insipidus, cloudy infection, pink red blood beets berries hematuria, orange medications bile…
Photo of Linea Nigra
Posted inWomen

Photo of Linea Nigra

Linea nigra is a dark vertical line running from pubis to sternum or navel on pregnant abdomen, resulting from melanocyte-stimulating hormone increase darkening the normally faint linea alba, more pronounced…
Arteries of the Brain
Posted inOrgans

Arteries of the Brain

A cerebral circulation map displays arteries supplying the brain, including the carotid arteries and Circle of Willis. The interconnected layout highlights redundancy in blood supply, which helps protect brain tissue…
Fetal Circulation
Posted inMedical

Fetal Circulation

Before birth, the fetus relies on unique circulatory shortcuts because its lungs are non-functional and it gets oxygen and nutrients from the placenta via the umbilical cord. Oxygen-rich blood enters…
Hyperbaric Chamber
Posted inMedical

Hyperbaric Chamber

Hyperbaric chambers deliver oxygen therapy by placing patients in pressurized environments, typically 2-3 atmospheres, forcing far more oxygen to dissolve in plasma beyond what hemoglobin carries, useful for decompression sickness…
Mechanical and Chemical DigestionN
Posted inMedical

Mechanical and Chemical DigestionN

Mechanical digestion physically breaks food into smaller pieces starting with mastication in mouth, churning in stomach via three muscle layers producing chyme, segmentation in small intestine mixing with enzymes, and…
Gallbladder
Posted inOrgans

Gallbladder

The gallbladder is a small pear-shaped sac tucked under the liver that stores and concentrates bile produced by hepatocytes. Between meals, the sphincter of Oddi stays closed, so bile backs…
Primary and Secondary Antibody Respons new
Posted inCell

Primary and Secondary Antibody Respons new

Primary antibody response upon first antigen encounter is slow, IgM appearing days 4-10 from naive B cells activated in nodes or mucosa, peaking low then declining, while secondary anamnestic from…
Germ Layers
Posted inCell

Germ Layers

During early embryonic development, the blastula reorganizes into three primary germ layers that give rise to all tissues and organs. The outer ectoderm forms skin, hair, nails, and the nervous…
Blood Volume Loss and Homeostasis
Posted inMedical

Blood Volume Loss and Homeostasis

An illustration of blood volume loss and homeostasis explains how the body responds to bleeding or dehydration. It shows sensors detecting reduced volume or pressure, triggering responses such as increased…
Lower Limb Arteries Anterior Posterior
Posted inMedical

Lower Limb Arteries Anterior Posterior

Lower limb arteries arise from the femoral artery continuing the external iliac, viewed anteriorly showing profunda femoris branching deep into thigh muscles, then popliteal behind the knee giving genicular branches,…
Catabolic and Anabolic Pathways
Posted inCell

Catabolic and Anabolic Pathways

A metabolic pathway diagram comparing catabolic and anabolic processes shows how the body balances breakdown and building. Catabolic pathways are illustrated breaking large molecules into smaller units while releasing energy,…
Defribillators
Posted inMedical

Defribillators

Defibrillators are lifesaving devices designed to deliver an electric shock to the heart when it's in a chaotic, ineffective rhythm like ventricular fibrillation or pulseless ventricular tachycardia during cardiac arrest,…