Cell
1. All living things consist of cell.
2. Our body also is made up of millions of cells.
3. Cells are very small in size. They can only be seen using a microscope.
4. Cells have different shapes and sizes.
5. Cells may be round, oblong, square or of other shapes.
6. Cell is the basic unit of life; its function is to carry out life processes.
7. Generally, every cell is made up of nucleus, cytoplasm and cell membrane.
Structure of cells
Cell membrane – is a thin layer around a cell. It separated a cell from other cells. It controls materials entering and leaving the cells.
Cytoplasm – is a jelly-like fluid in a cell. It is enclosed by the cell membrane. About 70% of cytoplasm consists of water. 30% are protein, starch, mineral salts and vitamins. Many chemical reactions take place in cytoplasm, such as broken down of food to produce energy.
Nucleus – big spherical structure controls all the activities of the cell. It contains genetic materials.
Nucleus and cytoplasm make up protoplasm.
Other cell structures include vacuole, cell wall and chloroplast.
Vacuole – containing cell sap. The cell sap contains dissolved sugar and mineral salts.
Cell wall – surrounding the cell membrane. Made of cellulose and found only in plant cells. Its strong and gives support and protection, also maintains the shape of the cells.
Chloroplasts – containing the green pigment chlorophyll. Its traps sunlight to carry out photosynthesis.
Comparison between plant and animal cell
Animal cell Plant cell
Size Usually small Usually big
Shape Not fixed because no cell wall Fixed shaped because of the cell wall
Cell wall Does not have cell wall Has a cell wall which is made of cellulose
Chloroplasts Does not have chloroplast Has chloroplasts, which contains chlorophyll pigment
Vacuole Does not have or very small Has large vacuole especially in mature cell
Food storage In form of glycogen In form of starch granules
plant cell and animal cell
Rabu, 10 Februari 2010
cell -note
Cell
1. All _________________ consist of cell.
2. Our body also is made up of millions of cells.
3. Cells are very small in___________ . They can only be seen using a ______________
4. Cells have different __________ and sizes.
5. Cells may be __________, ___________, square or of other shapes.
6. Cell is the ___________ of life; its function is to carry out life _____________.
7. Generally, every cell is made up of ___________, ___________ and ____________
Structure of cells
Cell membrane – __________________________________________________________________________
__________________________________________________________________________
Cytoplasm – _______________________________________________________________
__________________________________________________________________________
Nucleus – _________________________________________________________________
__________________________________________________________________________
Nucleus and cytoplasm make up ________________.
Other cell structures include ____________, ____________ and chloroplast.
Vacuole – ________________________________________________________________.
Cell wall – ________________________________________________________________
_________________________________________________________________________
Chloroplasts – ____________________________________________________________
_________________________________________________________________________
Comparison between plant and animal cell
Animal cell Plant cell
Size Usually small Usually big
Shape Not fixed because no cell wall Fixed shaped because of the cell wall
Cell wall Does not have cell wall Has a cell wall which is made of cellulose
Chloroplasts Does not have chloroplast Has chloroplasts, which contains chlorophyll pigment
Vacuole Does not have or very small Has large vacuole especially in mature cell
Food storage In form of glycogen In form of starch granules
Plant cell and animal cell (diagrams)
1. Typical plant cell
2. Typical animal cell
3. Cheek cell
4. Onion cell
5. amoeba
6. paramecium
7. euglena
8. Nerve cell
9. Muscle cell
10. Epithelial cell
1. All _________________ consist of cell.
2. Our body also is made up of millions of cells.
3. Cells are very small in___________ . They can only be seen using a ______________
4. Cells have different __________ and sizes.
5. Cells may be __________, ___________, square or of other shapes.
6. Cell is the ___________ of life; its function is to carry out life _____________.
7. Generally, every cell is made up of ___________, ___________ and ____________
Structure of cells
Cell membrane – __________________________________________________________________________
__________________________________________________________________________
Cytoplasm – _______________________________________________________________
__________________________________________________________________________
Nucleus – _________________________________________________________________
__________________________________________________________________________
Nucleus and cytoplasm make up ________________.
Other cell structures include ____________, ____________ and chloroplast.
Vacuole – ________________________________________________________________.
Cell wall – ________________________________________________________________
_________________________________________________________________________
Chloroplasts – ____________________________________________________________
_________________________________________________________________________
Comparison between plant and animal cell
Animal cell Plant cell
Size Usually small Usually big
Shape Not fixed because no cell wall Fixed shaped because of the cell wall
Cell wall Does not have cell wall Has a cell wall which is made of cellulose
Chloroplasts Does not have chloroplast Has chloroplasts, which contains chlorophyll pigment
Vacuole Does not have or very small Has large vacuole especially in mature cell
Food storage In form of glycogen In form of starch granules
Plant cell and animal cell (diagrams)
1. Typical plant cell
2. Typical animal cell
3. Cheek cell
4. Onion cell
5. amoeba
6. paramecium
7. euglena
8. Nerve cell
9. Muscle cell
10. Epithelial cell
Isnin, 21 Disember 2009
SELAMAT TAHUN BARU, AZAM BARU DAN SEMANGAT BARU, CITA-CITA HARUS DIKEJAR
SELAMAT bertemu kembali wahai anak didik ku yang dikasihi teristimewanya aspura dan aspuri. Menjelang sesi persekolahan, adakah semua mesti baru? pakaian baru? beg baru? kawan baru? buku baru? kasut baru? pen baru? pensil baru? pemadam baru??????
Ha jangan lupa, jika semua telah baru, fikiran juga mesti baru, azam juga mesti baru dan sikap juga mesti baru.
Tahun baru menyarankan kita berhijrah, berhijrah dari kesesatan kepada cahaya, berhijrah dari kejahilan kepada ilmu, berhijrah dari sifat malas kepada rajin.
Dari leka kepada sentiasa waspada
Dari lupa kepada ingat
Dari segala sifat mazmumah kepada mahmudah
Setahun berlalu dan usia bertambah, minda juga perlu bertambah.
Salam kasih sayang dari gurumu, juga ibumu.
Ha jangan lupa, jika semua telah baru, fikiran juga mesti baru, azam juga mesti baru dan sikap juga mesti baru.
Tahun baru menyarankan kita berhijrah, berhijrah dari kesesatan kepada cahaya, berhijrah dari kejahilan kepada ilmu, berhijrah dari sifat malas kepada rajin.
Dari leka kepada sentiasa waspada
Dari lupa kepada ingat
Dari segala sifat mazmumah kepada mahmudah
Setahun berlalu dan usia bertambah, minda juga perlu bertambah.
Salam kasih sayang dari gurumu, juga ibumu.
Isnin, 7 September 2009
LDL? HDL? APA BENDA TU ??????
LDL (Bad) Cholesterol
When too much LDL (bad) cholesterol circulates in the blood, it can slowly build up in the inner walls of the arteries that feed the heart and brain. Together with other substances, it can form plaque, a thick, hard deposit that can narrow the arteries and make them less flexible. This condition is known as atherosclerosis. If a clot forms and blocks a narrowed artery, heart attack or stroke can result.
HDL (good) Cholesterol
About one-fourth to one-third of blood cholesterol is carried by high-density lipoprotein (HDL). HDL cholesterol is known as “good” cholesterol, because high levels of HDL seem to protect against heart attack. Low levels of HDL (less than 40 mg/dL) also increase the risk of heart disease. Medical experts think that HDL tends to carry cholesterol away from the arteries and back to the liver, where it's passed from the body. Some experts believe that that HDL removes excess cholesterol from arterial plaque, thus slowing its buildup.
Triglycerides
Triglyceride is a form of fat made in the body. Elevated triglycerides can be due to overweight/obesity, physical inactivity, cigarette smoking, excess alcohol consumption and a diet very high in carbohydrates (60 percent of total calories or more). People with high triglycerides often have a high total cholesterol level, including a high LDL (bad) level and a low HDL (good) level. Many people with heart disease and/or diabetes also have high triglyceride levels.
Lp(a) Cholesterol
Lp(a) is a genetic variation of LDL (bad) cholesterol. A high level of Lp(a) is a significant risk factor for the premature development of fatty deposits in arteries. Lp(a) isn’t fully understood, but it may interact with substances found in artery walls and contribute to the buildup of fatty deposits.
When too much LDL (bad) cholesterol circulates in the blood, it can slowly build up in the inner walls of the arteries that feed the heart and brain. Together with other substances, it can form plaque, a thick, hard deposit that can narrow the arteries and make them less flexible. This condition is known as atherosclerosis. If a clot forms and blocks a narrowed artery, heart attack or stroke can result.
HDL (good) Cholesterol
About one-fourth to one-third of blood cholesterol is carried by high-density lipoprotein (HDL). HDL cholesterol is known as “good” cholesterol, because high levels of HDL seem to protect against heart attack. Low levels of HDL (less than 40 mg/dL) also increase the risk of heart disease. Medical experts think that HDL tends to carry cholesterol away from the arteries and back to the liver, where it's passed from the body. Some experts believe that that HDL removes excess cholesterol from arterial plaque, thus slowing its buildup.
Triglycerides
Triglyceride is a form of fat made in the body. Elevated triglycerides can be due to overweight/obesity, physical inactivity, cigarette smoking, excess alcohol consumption and a diet very high in carbohydrates (60 percent of total calories or more). People with high triglycerides often have a high total cholesterol level, including a high LDL (bad) level and a low HDL (good) level. Many people with heart disease and/or diabetes also have high triglyceride levels.
Lp(a) Cholesterol
Lp(a) is a genetic variation of LDL (bad) cholesterol. A high level of Lp(a) is a significant risk factor for the premature development of fatty deposits in arteries. Lp(a) isn’t fully understood, but it may interact with substances found in artery walls and contribute to the buildup of fatty deposits.
Sabtu, 5 September 2009
SALAM AIDIL FITRI
SELAMAT MENYAMBUT AIDIL FITRI, MAAF ZAHIR BATIN, SALAH SILAP HARAP DIAMPUNI, SALAM DIHULUR MAAF DIPINTA TERUTAMA KEPADA MEREKA YANG SAYA SELALU SAKITI.
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