Explanation

• Mitochondria produce most of the ATP used by the cell.
• They are the main sites of aerobic cellular respiration.

Last verified on 08-11-2026

Explanation

• Mitochondria are called the powerhouse of the cell.
• Because they produce Adenosine Triphosphate (ATP).
• ATP is the energy currency of the cell.
• ATP provides energy for different cellular activities such as movement, growth, and transport.
• Energy is produced through aerobic cellular respiration using oxygen and الغذائی molecules.
• They are found in the cytoplasm of most eukaryotic cells.
• Richard Altmann first described mitochondria in 1890.

Main Parts of a Cell:

1. Cell membrane → Outer protective layer
2. Nucleus → Controls cell activities
3. Cytoplasm → Jelly-like material between membrane and nucleus

Last verified on 09-05-2026

Explanation

• The heart is mainly composed of specialized cardiac muscle tissue.
• Cardiac muscles contract and relax rhythmically to pump blood throughout the body.

Last verified on 08-11-2026

Explanation

• An ecosystem consists of living organisms (biotic components) and non-living factors (abiotic components).
• Biotic components include plants, animals and microorganisms.
• Abiotic components include air, water, soil, sunlight and temperature.

Last verified on 08-11-2026

Explanation

• Seafood, especially sea fish and seaweed, are rich in iodine, a mineral vital for thyroid function.
• Iodine is naturally present in the ocean, making marine foods the best dietary source.

Last updated 07 Nov 2026 by NA