https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:cells-and-organisms/x0c5bb03129646fd6:cells-organisms/v/ms-cells-and-organisms 2022-09-10T03:04:58.582913383Z Cells and organisms All living things are made up of cells, which is the smallest unit that can be said to be alive. An organism may consist of one single cell (unicellular) or many different numbers and types of cells (multicellular). Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/4c87c6c9-4669-4319-91b7-935603e64401_1280_720_base.png Cells and organisms All living things are made up of cells, which is the smallest unit that can be said to be alive. An organism may consist of one single cell (unicellular) or many different numbers and types of cells (multicellular). https://cdn.kastatic.org/ka-youtube-converted/Uiqro5TUyLA.mp4/Uiqro5TUyLA.mp4 237 From Cells to Organs https://www.khanacademy.org/science/ms-biology/x0c5bb03129646fd6:cells-and-organisms/x0c5bb03129646fd6:cell-parts-and-functions/v/comparing-animal-and-plant-cells 2022-10-21T22:40:33.613234713Z Comparing animal and plant cells Plant cells have a cell wall in addition to a cell membrane, whereas animal cells have only a cell membrane. Plants use cell walls to provide structure to the plant. Plant cells contain organelles called chloroplasts, while animal cells do not. Chloroplasts allow plants to make the food they need to live using photosynthesis. Khan Academy video https://cdn.kastatic.org/ka_thumbnails_cache/56d3be07-e2e3-4665-9da5-d5ced92c2ef9_1280_720_base.png Comparing animal and plant cells Plant cells have a cell wall in addition to a cell membrane, whereas animal cells have only a cell membrane. Plants use cell walls to provide structure to the plant. Plant cells contain organelles called chloroplasts, while animal cells do not. Chloroplasts allow plants to make the food they need to live using photosynthesis. https://cdn.kastatic.org/ka-youtube-converted/HjC-eMiMDfo.mp4/HjC-eMiMDfo.mp4 237 From Cells to Organs https://www.khanacademy.org/science/up-sw-class-9-science-bridge-course/x2164f6ec11d6a504:week-3/x2164f6ec11d6a504:cell-parts/e/plant-and-animal-cells 2026-04-07T22:23:57.656416987Z Plant cells Let's solve some problems to better understand what makes up a plant cell. Aakash Bagga exercise https://www.khanacademy.org/science/bridge-course-class-10th-science/x37589313f9a4c197:untitled-78/x37589313f9a4c197:transportation/v/explanation-xylem 2023-07-03T13:44:16.33096147Z Explanation: Xylem Let's look at the explanation of the activity on xylem Vibhor Pandey video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Explanation: Xylem Let's look at the explanation of the activity on xylem https://cdn.kastatic.org/ka-youtube-converted/QgmVOrhj-tY.mp4/QgmVOrhj-tY.mp4 76 From Cells to Organs https://www.khanacademy.org/science/grade-7-science-snc-aligned/x64f379bc07a3640a:plant-systems/x64f379bc07a3640a:role-of-xylem-and-phloem-in-transport-of-water-and-food/v/phloem-translocation-ur 2025-08-08T00:24:37.843818748Z Phloem & translocation Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Phloem & translocation Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/HVt5KkjevpE.mp4/HVt5KkjevpE.mp4 787 From Cells to Organs https://www.khanacademy.org/science/in-in-class-10-biology/in-in-life-processes/in-in-transportation-in-plants/e/transportation-in-plants 2026-03-05T08:50:45.400692349Z Transportation in plants In this exercise we practice on how fluids are transported in plants. Saiyem exercise https://www.khanacademy.org/science/revision-term-1-ka-science-grade-9/x07cce91f26fedd3c:week-2/x07cce91f26fedd3c:tissues/v/squamous-epithelium 2023-02-17T10:37:20.19163475Z Squamous epithelium What does the squamous epithelium look like, where is it found, and what are its functions? Let's find out in this video. Moumita Sen video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Squamous epithelium What does the squamous epithelium look like, where is it found, and what are its functions? Let's find out in this video. https://cdn.kastatic.org/ka-youtube-converted/UnDrKcVKMgk.mp4/UnDrKcVKMgk.mp4 307 From Cells to Organs 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 From Cells to Organs 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 From Cells to Organs 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 From Cells to Organs 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 From Cells to Organs 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 From Cells to Organs 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/how-does-the-human-body-work/x0fe8768432761c62:neural-control-and-coordination/x0fe8768432761c62:overview-of-the-nervous-system/e/neurons 2026-03-05T08:50:45.400692349Z Neurons This exercise provides practice for basic understanding of a neuron. saiyem exercise https://www.khanacademy.org/science/up-sw-class-9-science-bridge-course/x2164f6ec11d6a504:week-3/x2164f6ec11d6a504:cells/e/animal-cells-and-tissues 2026-04-08T00:54:09.631945657Z Animal cells, tissues and nervous system Let's solve some problems to better understand animal cells and tissues and the differences between animal and plant cells. Aakash Bagga exercise https://www.khanacademy.org/science/shs-biology-2/x2ea931c66bba6acd:unit-1-name/x2ea931c66bba6acd:nervous-system/v/endocrine-system-major-hormones-functions-control-coordination-biology-khan-academy 2020-09-09T11:53:29Z Endocrine system (major hormones & functions) Let's explore the major endocrine glands, their major hormones, their major functions. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/eSkO1W4Op1O1d5YPTEYsTvZFFWTT0_SIjeXVMfyNhBSoQYWZ_kgxc6cKPoBODFH3koL3ztmA0U-A4eS4jFKJmNU Endocrine system (major hormones & functions) Let's explore the major endocrine glands, their major hormones, their major functions. https://cdn.kastatic.org/ka-youtube-converted/ySkk7U_4PeY.mp4/ySkk7U_4PeY.mp4 666 From Cells to Organs https://www.khanacademy.org/science/class-8-science/xa0f87b0f3c6fd88c:from-cells-to-organs/xa0f87b0f3c6fd88c:general-introduction-to-tissues/e/endocrine-glands 2025-02-13T13:40:25.85838563Z Endocrine glands Let's solve some questions! vibhor exercise https://www.khanacademy.org/science/up-biology-grade-11-revision-course-full-term/x01ceb15d0be61009:week-1/x01ceb15d0be61009:untitled-578/v/major-plant-hormones-how-to-remember-control-coordination-biology-khan-academy 2020-09-09T11:53:26Z Major plant hormones (& how to remember) Let's learn the 5 major plant hormones and how we can remember their functions. Mahesh Shenoy video https://cdn.kastatic.org/googleusercontent/GOt6IQceO9fAInrdiRbshZMVi9Hidjf2NT1SLXtCeKORqHB1ye1hPQhUo1BSSzYrz9op-qumpLE0jqTnV73HFPlG Major plant hormones (& how to remember) Let's learn the 5 major plant hormones and how we can remember their functions. https://cdn.kastatic.org/ka-youtube-converted/dV9QcGs58l0.mp4/dV9QcGs58l0.mp4 875 From Cells to Organs https://www.khanacademy.org/science/class-8-science/xa0f87b0f3c6fd88c:from-cells-to-organs/xa0f87b0f3c6fd88c:coordination-hormones-in-plants/e/coordination-in-plants 2023-10-19T15:02:25.789235076Z Coordination in plants Let's solve some questions on coordination in plants Vibhor Pandey exercise