Circulatory System

The circulatory system is an organ system that passes nutrients (such as amino acids and electolites), gases, hormones, bloods cells, etc. to and from cells in the body to help fight diseases and help stabilize body temperature and pH to maintain homeostasis. This system may be seen strictly as a blood distribution network, but some consider the circulatory system as composed of the cardiovascular system, which distributes blood1. and the lymphatic system 2. which distributesl lymph While humans, as well as other vertebrate, have a closed cardiovascular system (meaning that the blood never leaves the network of arteries, veins and capillaries), some invertebrate groups have an open cardiovascular system. The most primitive animal phyla lack circulatory system. The lymphatic system, on the other hand, is an open system. Appear full screen. Click here.

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Perkembangan Anak

Menghadapi remaja memang bukan pekerjaan yang mudah. Menurut Adams dan Gullota dalam Sarwono (1988), ada lima aturan kalau kita mau membantu remaja dalam menghadapi masalah mereka. Yang pertama adalah “trustworthiness” (kepercayaan), yaitu kita harus saling percaya dengan para remaja yangkita hadapi. Tanpa itu jangan harap ada komunikasi dengan mereka. Yang kedua adalah “genuineness” , yaitu maksud yang murni, tidak pura- pura. Ketiga adalah “empathi” , yaitu kemampuan untuk ikut merasakan perasaan- perasaan remaja. Keempat “honesty” , kejujuran. Dan yang terakhir tetapi terpenting adalah adanya pandangan dari pihak remaja, bahwa kita memang memenuhi keempat aturan tersebut di atas. Anda ingin belajar lebih banyak.....Klik di sini.

Ecosystem

Ecosystem is the unity between living thing and their environment. Ecosystem can be divided into natural ecosystem and artificial ecosystem. In the ecosystem there are relationship among the ecosystem component. Kinds of the relationship are : Mutualism symbiosis, comensalism symbiosis, parasitism symbiosis, predation and antibiosis. In the relationship among the ecosystem component, happens the energy flow. The energy is flowing from the producer to the highest consumer.
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