https://www.khanacademy.org/science/revision-term-1-ka-science-grade-9/x07cce91f26fedd3c:week-2/x07cce91f26fedd3c:tissues/v/simple-permanent-tissues 2023-06-30T09:52:14.335573887Z Simple permanent tissues Let's explore what simple permanent tissues are Khadijatul Qubra video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Simple permanent tissues Let's explore what simple permanent tissues are https://cdn.kastatic.org/ka-youtube-converted/MW68KNYgZdg.mp4/MW68KNYgZdg.mp4 350 Tissues https://www.khanacademy.org/science/revision-term-1-tg-biology-class-9/x55ae3f7a2ac497cf:week-1/x55ae3f7a2ac497cf:plant-tissues/v/dermal-tissue-part-1 2025-05-29T08:44:44.739717086Z Dermal Tissue Part 1 Do plants have skin like we do? Sort of! In this video, we explore the dermal tissue system in plants — focusing on the epidermis, the plant's outermost layer that wraps around roots, stems, and leaves. Here’s what you’ll learn in this video: 1. What the epidermis is and how it's structured? 2. How it protects against water loss, mechanical injury, and fungal attacks? 3. What stomata are, where they’re found (spoiler: not just on leaves), and how they help in gas exchange and transpiration? 4. The role of guard cells in opening and closing stomata. 5. Why the lower epidermis has more stomata than the upper epidermis? Bitasta Datta video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Dermal Tissue Part 1 Do plants have skin like we do? Sort of! In this video, we explore the dermal tissue system in plants — focusing on the epidermis, the plant's outermost layer that wraps around roots, stems, and leaves. Here’s what you’ll learn in this video: 1. What the epidermis is and how it's structured? 2. How it protects against water loss, mechanical injury, and fungal attacks? 3. What stomata are, where they’re found (spoiler: not just on leaves), and how they help in gas exchange and transpiration? 4. The role of guard cells in opening and closing stomata. 5. Why the lower epidermis has more stomata than the upper epidermis? https://cdn.kastatic.org/ka-youtube-converted/UJ3e4gR8jUE.mp4/UJ3e4gR8jUE.mp4 557 Tissues https://www.khanacademy.org/science/revision-term-1-tg-biology-class-9/x55ae3f7a2ac497cf:week-1/x55ae3f7a2ac497cf:plant-tissues/v/dermal-tissue-part-2 2025-05-22T09:37:44.828372942Z Dermal Tissue Part 2 You’ve met the plant’s outer layer — the epidermis. But did you know it also makes waxy sunscreens and grows absorbent arms? In this video, we explore how the epidermis gets clever with special structures like the cuticle and root hairs: 1. Learn how cutin (a waxy chemical) forms the cuticle, a protective layer that blocks UV rays and reduces transpiration. 2. Discover why desert plants have an extra-thick cuticle to save water. 3. Understand how root hairs grow from epidermal cells to boost water and mineral absorption This is Part 2 of our journey into dermal tissues. Whether you're wondering how plants survive the heat or slurp up water from the soil — this one’s for you! Bitasta Datta video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Dermal Tissue Part 2 You’ve met the plant’s outer layer — the epidermis. But did you know it also makes waxy sunscreens and grows absorbent arms? In this video, we explore how the epidermis gets clever with special structures like the cuticle and root hairs: 1. Learn how cutin (a waxy chemical) forms the cuticle, a protective layer that blocks UV rays and reduces transpiration. 2. Discover why desert plants have an extra-thick cuticle to save water. 3. Understand how root hairs grow from epidermal cells to boost water and mineral absorption This is Part 2 of our journey into dermal tissues. Whether you're wondering how plants survive the heat or slurp up water from the soil — this one’s for you! https://cdn.kastatic.org/ka-youtube-converted/fpNQ0UOraYE.mp4/fpNQ0UOraYE.mp4 218 Tissues https://www.khanacademy.org/science/bridge-course-class-11th-biology/xfa1bbeaa3bc88e64:cells-and-tissues/xfa1bbeaa3bc88e64:tissues/e/permanent-tissue 2024-02-06T11:52:32.699800961Z Simple and Complex Permanent tissue Let's solve some questions! vibhor exercise https://www.khanacademy.org/science/revision-term-1-ka-science-grade-9/x07cce91f26fedd3c:week-2/x07cce91f26fedd3c:tissues/v/ciliated-epithelium 2023-02-27T23:01:04.184405959Z Ciliated epithelium Here we show how ciliated epithelium works. Moumita Sen video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Ciliated epithelium Here we show how ciliated epithelium works. https://cdn.kastatic.org/ka-youtube-converted/HV4c4pVXihc.mp4/HV4c4pVXihc.mp4 247 Tissues https://www.khanacademy.org/science/bmc-grade-9-science/x345505a97fc4a662:introduction-to-biotechnology/x345505a97fc4a662:types-of-tissue/v/glandular-epithelium 2023-03-02T23:01:10.378516427Z Glandular epithelium Let's understand what glandular epithelium is and how it forms. Moumita Sen video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Glandular epithelium Let's understand what glandular epithelium is and how it forms. https://cdn.kastatic.org/ka-youtube-converted/rscxaGBZ3uA.mp4/rscxaGBZ3uA.mp4 344 Tissues https://www.khanacademy.org/science/bridge-course-class-11th-biology/xfa1bbeaa3bc88e64:cells-and-tissues/xfa1bbeaa3bc88e64:tissues/e/epithelial-tissue 2025-02-03T04:27:09.422733204Z Epithelial tissue Let's differentiate between different types of epithelial tissues. Moumita Sen exercise https://www.khanacademy.org/science/tg-grade-10-life-science-bridge-course/x567934b6011e38cb:animal-tissues/x567934b6011e38cb:connective-tissue/v/bone-and-cartilage 2025-10-01T17:00:46.216593062Z Bone and Cartilage What makes our body strong yet flexible? In this video, we will explore the structure, function, and location of bone and cartilage. We will learn what bone tissue is made of- the types of cells, matrix, and minerals and how it supports movement and protection. We will understand the role of cartilage in providing flexibility and cushioning joints. Finally, we will discuss how bone and cartilage are different from each other to see their key differences. Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Bone and Cartilage What makes our body strong yet flexible? In this video, we will explore the structure, function, and location of bone and cartilage. We will learn what bone tissue is made of- the types of cells, matrix, and minerals and how it supports movement and protection. We will understand the role of cartilage in providing flexibility and cushioning joints. Finally, we will discuss how bone and cartilage are different from each other to see their key differences. https://cdn.kastatic.org/ka-youtube-converted/FKgxB3wY9_s.mp4/FKgxB3wY9_s.mp4 629 Tissues https://www.khanacademy.org/science/health-and-medicine/advanced-muscular-system/skeletal-system-introduction/v/ligaments-tendons-and-joints 2023-09-10T17:11:17.624018169Z Ligaments, tendons, and joints Ligaments and tendons, strong connective tissues, link bones and muscles. Bones meet at joints, which come in three types: synarthroses (immovable, like in the skull), amphiarthroses (slightly movable, like vertebral joints), and synovial joints (highly movable, like shoulders and hips). Synovial joints are lubricated by synovial fluid and lined by articular cartilage. Overuse can lead to arthritis, causing pain and stiffness. Tracy Kim Kovach video https://cdn.kastatic.org/googleusercontent/P15q_jjISbUPZZYvhOWkN9iREKHIaAU8Xqsb42MHJDGJcjLkk5FNPU_taTYE7RP-ZBJ4HxSSasQpZSjsz4GYzqvN Ligaments, tendons, and joints Ligaments and tendons, strong connective tissues, link bones and muscles. Bones meet at joints, which come in three types: synarthroses (immovable, like in the skull), amphiarthroses (slightly movable, like vertebral joints), and synovial joints (highly movable, like shoulders and hips). Synovial joints are lubricated by synovial fluid and lined by articular cartilage. Overuse can lead to arthritis, causing pain and stiffness. https://cdn.kastatic.org/ka-youtube-converted/frvv37WJjm4.mp4/frvv37WJjm4.mp4 167 Tissues https://www.khanacademy.org/science/bridge-course-class-11th-biology/xfa1bbeaa3bc88e64:cells-and-tissues/xfa1bbeaa3bc88e64:tissues/e/connective-tissue 2026-04-08T08:09:55.69362548Z Connective tissue Let's practice differentiating between different types of connective tissue. Moumita Sen exercise https://www.khanacademy.org/science/revision-term-1-tg-biology-class-9/x55ae3f7a2ac497cf:week-2/x55ae3f7a2ac497cf:animal-tissues/v/muscular-tissue 2025-09-05T04:00:40.052481652Z Muscular tissue In this video, we will the structure and characteristics of muscular tissue. We will dwell deep about the types of muscles in the human body—striated (skeletal), smooth (involuntary), and cardiac muscles. Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Muscular tissue In this video, we will the structure and characteristics of muscular tissue. We will dwell deep about the types of muscles in the human body—striated (skeletal), smooth (involuntary), and cardiac muscles. https://cdn.kastatic.org/ka-youtube-converted/LFj9e5H62Mk.mp4/LFj9e5H62Mk.mp4 648 Tissues https://www.khanacademy.org/science/tg-grade-10-life-science-bridge-course/x567934b6011e38cb:animal-tissues/x567934b6011e38cb:muscular-and-neural-tissues/v/node-of-ranvier 2025-09-05T04:00:40.052481652Z Node of Ranvier In this video, we will learn about the Node of Ranvier, the myelin sheath, and how saltatory conduction enables signals to jump from node to node for maximum speed. Learn how ions and charge changes at each node ""recharge"" the impulse, making myelinated neurons lightning-fast compared to non-myelinated ones. Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Node of Ranvier In this video, we will learn about the Node of Ranvier, the myelin sheath, and how saltatory conduction enables signals to jump from node to node for maximum speed. Learn how ions and charge changes at each node ""recharge"" the impulse, making myelinated neurons lightning-fast compared to non-myelinated ones. https://cdn.kastatic.org/ka-youtube-converted/m7TCTFnGijI.mp4/m7TCTFnGijI.mp4 345 Tissues https://www.khanacademy.org/science/bridge-course-class-11th-biology/xfa1bbeaa3bc88e64:cells-and-tissues/xfa1bbeaa3bc88e64:tissues/e/muscular-tissue-and-neural-tissue 2026-04-03T18:30:01.793877038Z Muscular tissue and neural tissue This exercise covers the different types of muscular and neural tissues. Moumita Sen exercise https://www.khanacademy.org/science/tg-grade-10-life-science-bridge-course/x567934b6011e38cb:animal-tissues/x567934b6011e38cb:muscular-and-neural-tissues/e/grade-9-nodes-of-ranvier 2026-04-08T00:54:09.631945657Z Nodes of Ranvier This exercise focuses on understanding nodes of ranvier and their role in the nervous system. Aishwarya Ramakrishnan exercise