Animal Tissues & Frog Anatomy — Quick Review (10 Sentences) — Summary

Animal tissues are grouped into four types: epithelial, connective, muscular, and neural, each with distinct structural features and functions tested in NEET. 2. Epithelial tissue is avascular, rests on a basement membrane, and includes simple types (squamous, cuboidal, columnar, ciliated, glandular) and multi-layered compound epithelium for protection. 3. Connective tissue is the most abundant tissue and is defined by an extensive extracellular matrix; blood is a specialized connective tissue with plasma as its matrix. 4. Tendons connect muscle to bone while ligaments connect bone to bone — both are dense regular connective tissue but ligaments also contain elastin fibres. 5. Cartilage has chondrocytes in lacunae within a chondroitin sulfate matrix; bone has osteocytes arranged in concentric lamellae around the Haversian canal in a calcium phosphate matrix. 6. Skeletal muscle is striated and voluntary; smooth muscle is non-striated and involuntary; cardiac muscle is striated and involuntary with intercalated discs and autorhythmic properties. 7. Neural tissue consists of excitable neurons (cyton, dendrites, axon) and non-excitable neuroglia that support, insulate, and protect neurons throughout the nervous system. 8. The frog (Rana tigrina) has a three-chambered heart with two atria and one ventricle, and respires through three simultaneous routes: skin, buccal cavity, and lungs. 9. The frog is ureotelic, excreting urea through mesonephric kidneys, with all reproductive, digestive, and excretory products exiting through a single cloaca. 10. Male frogs bear vocal sacs and nuptial pads for reproduction, possess 10 pairs of cranial nerves, and undergo external fertilization in water.