sistem saraf manusia

Unit asas dalam sistem saraf manusia dipanggil neuron. Terdapat berjuta-juta neuron dalam sistem saraf manusia. Neuron merupakan sel-sel yang dikhususkan untuk mengalirkan impuls. Impuls ialah isyarat elektrik yang bergerak dengan sangat pantas.
Setiap neuron mempunyai badan sel yang mengandungi nukleus dan sitoplasma. Pada badan sel neuron, terdapat banyak gentian halus yang disebut dendrit. Dendrit membawa impuls saraf ke badan sel.
Impuls dibawa keluar daripada badan sel oleh akson.

Tips Kesihatan Jantung

Bab 1,Tingkatan Lima-aliran sains tulen bertajuk Transportation. Bagi menyalurkan darah ke seluruh anggota badan, jantung memainkan peranan dalam tugas ini. Jantung bertanggungjawab mengepam darah ke seluruh tubuh. Jika fungsi jantung terganggu, maka sistem-sistem di dalam badan kita akan turut terganggu. Oleh itu, memiliki jantung yang sihat adalah penting supaya setiap sistem di dalam badan dapat berfungsi secara total.

Tips-tips Kesihatan Jantung:- (since that all of you are studying Biology in english, maybe it's easier to understand these in English Language. Feel free to ask if there're anything you don't understand)

Learn how to eat a healthy heart diet. All of the food you eat effects the health of your heart. Learn which foods are heart smart and try to include them as a regular part of your diet. You may refer to the food pyramid. No matter which eating plan you follow, the following guidelines are recommended:

• Total fat intake should be less than 30 percent of total calories daily.


• Saturated fatty acid intake should be less than 10 percent of total calories daily.


• Polyunsaturated fatty acid intake should be no more that 10 percent of total calories daily.


• Monounsaturated fatty acids make up the rest of total fat intake, about 10 to 15 percent of total calories daily.


• Cholesterol intake should be no more than 300 milligrams per day.


• Sodium intake should be no more than 3000 milligrams per day.


• Beware of chemicals in your food like caffeine, MSG, and other food additives.

Keep your heart clean. The human heart's job is to pump nutrient-rich blood throughout your body. If you smoke, take drugs, or drink alcohol excessively, you are giving your heart extra work. How do you feel when you have too much work to do? Your heart cannot handle too much extra work over a long period of time. Over time, the health of your heart will suffer.

Scientists have proven that smoking doubles your risk of having a heart attack and doubles, triples, or quadruples your risk of sudden cardiac death. Each year, over 300,000 Americans die of smoking-related heart disease. So, don't smoke. If you do, quit. The sooner you quit, the sooner your risk will start to decline. There is hope. Former smokers can completely lower their risk of sudden cardiac death within ten years of quitting.

Everyday Heart Health Tips:-
If you're not convinced about the need to develop an exercise program for your life, you can at least try following some of these tips in your everyday routine. Take advantage of any opportunity for exercise. Try some today.

Take the stairs instead of an elevator or escalator at school or the mall. Just start with one flight. Soon, you'll be ready for two.

Park your car at the far end of the parking lot. The short walk to and from the store or school helps your heart.

If you ride a bus or subway, get off a stop before your destination. Walk the rest of the way.

If you can, spend a few minutes of your lunch break taking a stroll around the campus grounds. It should help you stay awake after lunch.

Think of housework as an extra chance to exercise. Vacuuming briskly can be a real workout.
Mowing the lawn, pulling weeds, and raking leaves are chores that can be done yourself as a chance to exercise.

If you have a family, schedule an after-dinner walk. Make it quality time.(you should plan on this.. :-)

Thus, by doing all of the recommended tasks-controlling diet, keeping the heart clean and exercising, you can prevent yourselves from having cardiovascular disease or heart-related disease-atherosclerosis, Coronary Artery Disease [CAD], heart attack and many more.

**ALL the informations above are taken from these website. It's interesting to explore!**

http://www.fi.edu/learn/heart/healthy/healthy.html

~Wallahua'lam~

Jantung kita

Jantung kita dicipta khas bagi memenuhi keperluannya sebagai pam yang mengepam darah keseluruh badan. Jantung manusia dibina daripada otot miokardium iaitu sejenis otot yang mengecut secara beritma yang dicetuskan tanpa melibatkan kawalan saraf.

Dalam dinding atrium kanan terdapat satu berkas kecil tisu yang dinamakan nodus sinuatrium. Di bahagian dasar septum atrium kanan pula terdapat satu kawasan tisu yang dinamakan nodus atrioventrikal.

Peredaran darah disebabkan pengecutan otot kardiak pada jantung. Pengecutan jantung bermula apabila nodus sinuatrium mula menjanakan impuls (maklumat elektrik ) di kedua-dua atrium dan menyebabkannya mengecut. Nodus sinuatrium juga dikenali sebagai perentak.

Why DO i love biology?

Biology comes from Greek words "BIOS" & "LOGOS" which mean "a study about life". Biology is a very interesting subject because it teaches us about life, how we live, how we breathe, and so on. Through biology, we can get closer to Allah, to know our creator-ma'rifatullah because we could see how great Allah is in creating all His unique creatures. Lets observe how Allah creates us. Our body is build up from a few systems that come from the combination of a few organs. An organ is made up from a clump of tissues; the tissues consist of cell that are arranged in a very systematic arrangement. Plus, when we looked into the cell there are organelles-mitochondria, nucleus, ribosomes and others that carry the cell lifecycle.

(say SUBHANALLAH). Allah has creates a human being, a plant and an animal starting from the smallest cycles(cells lifecycle) that enable a human, a plant & an animal to live on earth.

"But His command , when He intendeth a thing , is only that he saith unto it : Be! and it is"

Believe that only Allah can create such complex creatures. AllahuAkbar!

cintai bio, cintai pencipta kita

salam,
selamat datang ke laman biologi. mengenali bio, kita akan lebih mengenali pencipta kita.