Cytology
Study cells as organized living systems. Cytology connects membranes, compartments, molecular machinery, cytoskeleton, transport, energy conversion, signaling, growth, division, and experimental evidence across many scales.
A cell is not a bag of tiny departments. It is an interacting physical system.
The confocal-style world behind the page shows one generalized animal-cell slice with membrane, nucleus, rough ER, Golgi, mitochondria, microtubule tracks, and a single slow transport carrier. The composition is deliberately schematic, but its relationships are biologically grounded.
Study lipid bilayers, membrane proteins, diffusion, osmosis, channels, carriers, pumps, electrochemical gradients, endocytosis, exocytosis, and selective transport.
Study the nucleus, endoplasmic reticulum, Golgi apparatus, mitochondria, lysosomes, peroxisomes, vesicles, and how compartment boundaries organize cellular chemistry.
Study actin filaments, microtubules, intermediate filaments, motor proteins, intracellular transport, cell shape, mechanical support, cilia, flagella, and cell movement.
Study ATP coupling, redox chemistry, glycolysis, mitochondrial respiration, metabolic pathways, energy transfer, biosynthesis, and the relationship between cellular structure and metabolism.
Follow information and material from transcription and translation through folding, targeting, rough ER, vesicles, Golgi processing, secretion, membranes, and intracellular destinations.
Study receptors, ligands, second messengers, phosphorylation, signal amplification, feedback, gene regulation, cell-cell communication, and how cells respond to changing environments.
Study cell-cycle control, DNA replication, checkpoints, mitosis, cytokinesis, chromosome segregation, growth, quiescence, senescence, and regulated cell death.
Study cell adhesion, tight and gap junctions, anchoring structures, extracellular matrix, mechanotransduction, polarity, tissue organization, and communication between cells and their surroundings.
Study optical and electron microscopy, fluorescence, labeling, live-cell imaging, cell culture, fractionation, flow cytometry, image interpretation, controls, resolution, and experimental limitations.
Select a structure, then follow its dependencies outward.
The old page treated organelles as factory departments and displayed invented counts and performance metrics. The new lab focuses on actual structures, processes, and connections, and keeps scale limitations visible.
How do cellular structures divide work and exchange material?
Select a structure to connect its local role to the rest of the cell. The drawing emphasizes relationships, not literal scale, abundance, shape, or position. Real cells vary strongly across cell type, organism, developmental state, activity, and experimental preparation.
Double-membrane compartment
Contains most of the nuclear genome in eukaryotic cells and organizes processes including transcription, RNA processing, DNA replication, and chromosome segregation.
The diagram combines structures that operate across very different spatial scales. A ribosome, membrane bilayer, Golgi stack, mitochondrion, and nucleus cannot be drawn together at one truthful scale and remain readable.
A cell diagram and a micrograph answer different questions.
A teaching diagram can place structures together clearly even when their real sizes, shapes, numbers, and positions vary.
Visible structures depend on optical resolution, contrast, staining or fluorescence, specimen preparation, and what labels are present.
Higher spatial resolution can reveal membrane and ultrastructural detail, but preparation produces a particular view of fixed material rather than a live whole cell.
Time-dependent behavior can be observed, but labels, illumination, sampling rate, focal plane, and experimental conditions shape what becomes visible.