{"product_id":"comparative-vertebrate-hearts-specimen-paperweight-5-classes-in-resin","title":"Comparative Vertebrate Hearts Specimen Paperweight – 5 Classes in Resin","description":"\u003cp\u003e\u003cstrong\u003eA Landmark Evolutionary Biology Specimen: The Five Vertebrate Classes of Hearts in Optical Resin\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWitness one of the most celebrated evolutionary milestones of life on Earth with the Acever Comparative Hearts Specimen Paperweight (Model: E1405). Embedded side by side within a horizontal, optical-grade acrylic resin block (164 × 78 × 24 mm) are five authentic, professionally prepared vertebrate hearts representing the five major vertebrate classes: Pisces (Fish, 1), Amphibia (Amphibian\/Toad, 2), Reptilia (Reptile\/Lizard, 3), Aves (Bird\/Pigeon, 4), and Mammalia (Mammal\/Rabbit or Rat, 5). Each cardiac specimen features high-contrast microvascular injections—vibrant red highlighting arterial arches and main vessels, and deep blue delineating venous return pathways—demonstrating the evolutionary transition from a single-circuit, two-chambered fish heart to the fully separated, double-circulation four-chambered avian and mammalian heart. Complete with numbered indices (1–5) and titled \"Comparative Hearts\" across the top, this museum-grade teaching preparation serves as an indispensable visual anchor for evolutionary biology, comparative anatomy curricula, medical physiology courses, and natural science collections.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWHY YOU'LL LOVE IT\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e✦ \u003cstrong\u003eFive Real Vertebrate Hearts Side by Side\u003c\/strong\u003e – Showcases genuine biological heart specimens from fish, amphibian, reptile, bird, and mammal in clear chronological sequence.\u003c\/li\u003e\n  \u003cli\u003e✦ \u003cstrong\u003eClear Evolutionary Circulation Milestone\u003c\/strong\u003e – Visually demonstrates the progression from 2-chambered (fish), 3-chambered (amphibian\/reptile), to complete 4-chambered double circulation (bird\/mammal).\u003c\/li\u003e\n  \u003cli\u003e✦ \u003cstrong\u003eDual-Color Microvascular Injections\u003c\/strong\u003e – Vivid red arterial vessels and deep blue venous structures accentuate intricate aortic arches and coronary branches.\u003c\/li\u003e\n  \u003cli\u003e✦ \u003cstrong\u003eNumbered Evolutionary Index (1–5)\u003c\/strong\u003e – Clear sequential numbers below each specimen provide effortless reference for comparative classroom lectures and self-study.\u003c\/li\u003e\n  \u003cli\u003e✦ \u003cstrong\u003eCrystal-Clear Optical Acrylic Block\u003c\/strong\u003e – Substantial 164 × 78 × 24 mm resin brick offers crystal clarity and 360-degree inspection with zero distortion.\u003c\/li\u003e\n  \u003cli\u003e✦ \u003cstrong\u003eSafe, Odorless \u0026amp; Permanent Preservation\u003c\/strong\u003e – Modern acrylic resin embedding eliminates pungent chemical preservatives, jars, and fragile specimen maintenance.\u003c\/li\u003e\n  \u003cli\u003e✦ \u003cstrong\u003eDistinguished Academic \u0026amp; Collector Gift\u003c\/strong\u003e – An extraordinary conversational showpiece for cardiologists, medical students, evolutionary biologists, STEM educators, and curiosity cabinets.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePERFECT FOR\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCardiology specialists, medical and veterinary students, evolutionary biology departments, high school AP biology classrooms, nature centers, and fine curiosity cabinets.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eSPECIFICATIONS\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e E1405\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSpecimen:\u003c\/strong\u003e 5 Real Vertebrate Hearts (Fish, Amphibian, Reptile, Bird, Mammal)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Optical-Grade Acrylic Resin\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 164 × 78 × 24 mm (approx. 6.5 × 3.1 × 0.9 inches)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Crystal Clear Resin with Articulated Vascular-Injected Hearts\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eForm:\u003c\/strong\u003e Horizontal Rectangular Block with Numbered Labels (1–5)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003e*Notice: Price is for retail. Bulk and wholesale orders can get a discount. Please contact us for custom volume inquiries.*\u003c\/em\u003e\u003c\/p\u003e","brand":"Acever","offers":[{"title":"Default Title","offer_id":47170403729604,"sku":"E1405","price":36.57,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0030\/2569\/8861\/files\/acever-resin-specimen-paperweight-e1405-comparative-hearts_45d123d1-e505-45cf-ae00-ee787c4197aa.jpg?v=1793864847","url":"https:\/\/acever.com\/products\/comparative-vertebrate-hearts-specimen-paperweight-5-classes-in-resin","provider":"Acever","version":"1.0","type":"link"}