Zoology: Scientific Figures & Vector Diagrams

An alveolus is a air sac found in the bronchi of the lungs. The alveoli are surrounded by a capillary bed. The type I pneumocytes allow gas exchange, while the type II pneumocytes produce surfactant to prevent the collapse of the alveolus.

The gastrointestinal tract, also called the digestive tract, alimentary canal, or gut, is the system of organs within multicellular animals that takes in food, digests it to extract energy and nutrients, and expels the remaining waste.

Nephron, Diagram of the urine formation. The number inside tubular urin concentration in mOsm/l - when ADH acts

Hemoglobin is an allosteric heterotetrameric (α₂β₂) metalloprotein in red blood cells that transports oxygen from respiratory surfaces to peripheral tissues.

Diagram describing the phases of the human cardiac cycle. Vectorization of File:2027 Phases of the Cardiac Cycle.jpg. Created upon request.

The eukaryotic cytoskeleton is a dynamic filament lattice composed of actin microfilaments, microtubules, and intermediate filaments.

Amphibian Egg: 1. Jelly Capsule 2. Vitelline Membrane 3. Perivitelline Fluid 4. Yolk Plug 5. Embryo The jelly capsule is designed to protect the embryo from the outside environment. This capsule also prevents the egg from drying out. The vitelline membrane is a membrane surrounding the egg. Upon fertilization, this membrane splits off from the surface of the egg and the space between the vitelline

Sonic hedgehog in limb development, based on material published in Harfe BD, Scherz PJ, Nissim S, Tian H, McMahon AP and Tabin CJ (2004). "Evidence for an expansion-based temporal Shh gradient in specifying vertebrate digit identities". Cell 118 (4): 517-528.

Cross section scheme of vertebrate embryo. 1 – neural crest, 2 – neural tube, 3 – dorsal somite, 4 – notochord. Both paths of the neural crest cells migation marked by arrows: red one is the dorsolateral path, blue one signs the ventromedial path.

This diagram is showing the difference of the two major types of coelomates: the protostomes (molluscs, annelids, arthropods, ...) and deuterostomes (echinoderms, vertebrates, ...). These groups differ in several characteristics of early development; In deuterostomes blastula divisions is called "radial cleavage" because it occurs parallel or perpendicular to the major polar axis. In protostomes t

This diagram depicts a cross section of a vertebrate embryo in the neurula stage. This stage is characterized by development of the nervous system through the formation of the neural tube. The neural tube later develops into the brain and the spinal cord. The other structures in the diagram also play major roles in development. The notochord functions as a dorsal supporting rod until it is replace

Allopatric speciation can result from elevational topography. Climatic changes can drive species into altitudinal zones, isolating populations. 1: Higher elevation peaks act as "islands" to promote speciation. 2: Lower elevation valleys act as "islands" to promote speciation.[1]

Evolutionary mechanisms and ecological trophic dynamics structure biodiversity across spatial and temporal scales.

The geologic time scale proportionally represented as a log-spiral. Some key events in Earth's history are marked on the diagram, including major extinction events, global scale glaciations, the initiation of permanent atmospheric oxygen, the formation of the moon, and the formation of Earth's magnetic field. The outer spiral arcs show components of the evolution of life on Earth. Ma=Megaannus (un

The principle of homology: The biological derivation relationship (shown by colors) of the various bones in the forelimbs of four vertebrates is known as homology and was one of Darwin’s arguments in favor of evolution.

Diagram showing how allele frequencies can respond to natural selection (stabilizing, disruptive, and directional to either extreme).

A simplified diagram of the process of reinforcement. Two incipient species evolve complete reproductive isolation due to selection rejecting unfit hybrids. Here, mate discrimination acts to reinforce the speciation process.

A simplified diagram of sympatric speciation. Reproductive isolation evolves within a population without the aide of geographic barriers.

This detailed scientific diagram illustrates Coelomate 01 in the context of Zoology.

LMs and SEMs of b- and p-mastigophores. a) Undischarged mesobasic b-mastigophores of Metridium senile. b) Undischarged p-mastigophores of Cariophyllia smithi. c) A discharged mesobasic heterotrichous b-mastigophore of M. senile. d) Parts of shafts of homotrichous mesobasic b-mastigophores of M. senile. e) Parts of darts from M. senile.

Authoritative scientific diagram illustrating Nematocyst-discharge process with academic labeling and conceptual fidelity.

This detailed scientific diagram illustrates Grasshopper Mouth Anatomy in the context of Zoology.

This detailed scientific diagram illustrates Insect Anatomy in the context of Zoology.

Anatomical diagram of the hypothetical ancestral mollusc (“HAM”). Nervous system is hypoathroid. Unsegmented, bilaterally symmetrical body, organs occur either singly or in pairs (no metamerism), hemocoel circulatory system filled with hemocyanin, gametes ejected into pericardium and travel through nephridia to environment.

This detailed scientific diagram illustrates Archimollusc in the context of Zoology.

The principle of homology: The biological derivation relationship (shown by colors) of the various bones in the forelimbs of four vertebrates is known as homology and was one of Darwin’s arguments in favor of evolution. NOTE : Black-and-White version of original " File:Homology vertebrates-en.svg " image created via following programs: " Inkscape " (version 0.92.4) [bw image], " PrintScreen " (Windows 10), " Paint " (Windows 10) [png image] and " JASC Paint Shop Pro " (version 6.02) [crop] - Enjoy! :) Drbogdan ( talk ) 14:39, 15 February 2019 (UTC)