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Post a LessonAnswered on 15 Apr Learn CBSE/Class 10/Science/Unit II: World of Living/Life Processes
Sadika
The schematic representation of gaseous exchange in tissues typically involves the movement of oxygen (O2) from the bloodstream into the cells and the exchange of carbon dioxide (CO2) from the cells into the bloodstream. In tissues, oxygen diffuses from the capillaries into the interstitial fluid and then into the cells where it is used for cellular respiration. Simultaneously, carbon dioxide produced during cellular respiration diffuses out of the cells into the interstitial fluid and then into the capillaries to be transported back to the lungs for exhalation.
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Answered on 15 Apr Learn CBSE/Class 10/Science/Unit II: World of Living/Life Processes
Sadika
Alveoli in the lungs and nephrons in the kidneys serve different physiological functions but share some structural and functional characteristics. Both have a high surface area for efficient exchange processes. Alveoli are tiny air sacs in the lungs where gas exchange occurs, characterized by thin walls and a dense network of capillaries. Nephrons are the functional units of the kidneys responsible for filtering blood and producing urine, consisting of a renal corpuscle and a renal tubule. While alveoli facilitate the exchange of gases (oxygen and carbon dioxide) between the air and the blood, nephrons filter waste products and regulate electrolyte balance and blood pressure through processes such as filtration, reabsorption, and secretion.
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Answered on 15 Apr Learn CBSE/Class 10/Science/Unit II: World of Living/Control and co-ordination in animals and plants
Sadika
Reflex action is an involuntary and rapid response to a stimulus that bypasses conscious thought. It involves a simple neural pathway called a reflex arc, which includes a sensory neuron, interneuron, and motor neuron. Walking, on the other hand, is a voluntary and coordinated movement involving various muscle groups controlled by the brain's motor cortex and cerebellum. Unlike reflex actions, walking requires conscious intention and coordination between different parts of the brain and muscles.
read lessAnswered on 15 Apr Learn CBSE/Class 10/Science/Unit II: World of Living/Control and co-ordination in animals and plants
Sadika
At the synapse between two neurons, neurotransmitters are released from the presynaptic neuron into the synaptic cleft. These neurotransmitters then bind to receptors on the postsynaptic neuron, causing a change in its membrane potential. This results in the propagation of the electrical signal across the synaptic gap from one neuron to the next.
read lessAnswered on 15 Apr Learn CBSE/Class 10/Science/Unit II: World of Living/Control and co-ordination in animals and plants
Sadika
The cerebellum, located at the back of the brain, plays a crucial role in maintaining posture and equilibrium of the body. It receives sensory input from the vestibular system, which detects changes in head position and movement, and integrates this information to coordinate muscle activity and maintain balance.
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