Mari kita pelajari sistem ekskresi, sistem yang berperan dalam pembuangan zat sisa metabolisme tubuh.Sistem ekskresi terdiri dari empat organ utama yang bekerja sama untuk membuang zat-zat sisa dari tubuh.Ginjal adalah organ ekskresi utama yang membuang urea dan zat sisa melalui urin.Paru-paru mengeluarkan karbon dioksida dan uap air saat kita bernapas.Hati berperan penting dalam mengubah amonia yang beracun menjadi urea yang lebih aman untuk tubuh.Kulit membantu mengeluarkan zat sisa melalui keringat yang mengandung air dan garam mineral.Sistem ekskresi membuang berbagai zat sisa metabolisme, termasuk urea, karbon dioksida, garam mineral, dan air.Selanjutnya, kita akan mempelajari lebih detail tentang ginjal dan proses pembentukan urin.The kidney filters blood through microscopic units called nephrons.Each nephron contains a glomerulus, which is a cluster of tiny blood vessels where filtration begins.Blood flows through the glomerulus, where pressure forces water, salts, and waste products through the filter.The filtered fluid enters the proximal tubule, where useful substances like glucose and amino acids are reabsorbed.As the fluid travels through the loop of Henle, water and salt concentrations are adjusted.In the distal tubule, additional waste products are secreted into the fluid, and final adjustments to ion concentrations are made.The final product, urine, flows through the collecting duct to the bladder for storage until excretion.The skin is composed of three main layers: the epidermis, dermis, and subcutaneous layer.Within the dermis layer, we find sweat glands. These coiled structures produce and secrete sweat through ducts that lead to pores on the skin's surface.When body temperature rises, these glands produce sweat, which contains water, minerals, and waste products.As we exercise or experience high temperatures, our body produces sweat to help regulate temperature.As sweat evaporates from our skin, it takes heat energy with it, effectively cooling our body.The average person has between two and four million sweat glands, which can produce up to two to four liters of sweat per hour during intense activity.The lungs are specialized organs for gas exchange, with millions of tiny air sacs called alveoli.Let's zoom in to see a single alveolus and its surrounding blood vessels.Blood capillaries wrap around each alveolus, allowing for efficient gas exchange.Oxygen molecules from the air in the alveolus diffuse into the bloodstream.Meanwhile, carbon dioxide from the blood diffuses into the alveolus to be exhaled.During inhalation, the alveoli expand, drawing in fresh oxygen.During exhalation, the alveoli contract, pushing out carbon dioxide.This continuous exchange of gases is essential for cellular respiration and maintaining life.Hati memiliki peran penting dalam proses detoksifikasi tubuh.Salah satu fungsi utama hati adalah mengubah amonia yang beracun menjadi urea yang lebih aman bagi tubuh.Amonia yang berasal dari pemecahan protein diubah menjadi urea melalui siklus urea di hati.Hati juga berperan dalam memecah sel darah merah yang sudah tua.Sel darah merah tua dipecah menjadi bilirubin, yang memberi warna coklat pada feses.Proses detoksifikasi ini berlangsung terus menerus untuk menjaga keseimbangan tubuh.Hati terus bekerja mengubah zat-zat beracun menjadi zat yang dapat dikeluarkan oleh tubuh.
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