A cell consists of three parts: the cell membrane, the nucleus, and, between the two, the cytoplasm. Within the cytoplasm lie intricate arrangements of fine fibers and hundreds or even thousands of miniscule but distinct structures called organelles.

Cells provide six main functions. They provide structure and support, facilitate growth through mitosis, allow passive and active transport, produce energy, create metabolic reactions and aid in reproduction.

Cell structures and their functions Contains genetic material, including DNA, which controls the cell’s activities. Its structure is permeable to some substances but not to others. It therefore controls the movement of substances in and out of the cell. Most cells are specialised and are adapted for their function.

Cells provide six main functions. They provide structure and support, facilitate growth through mitosis, allow passive and active transport, produce energy, create metabolic reactions and aid in reproduction. Cells are the basic building blocks of all living things.

The skin

brain

The heart has the ability to beat over 3 billion times in a person’s life. The strongest muscle based on its weight is the masseter. With all muscles of the jaw working together it can close the teeth with a force as great as 55 pounds (25 kilograms) on the incisors or 200 pounds (90.7 kilograms) on the molars.

Knee (This joint is arguably the weakest area of the human body).

Some of the easily recognisable internal organs and their associated functions are:

• The brain. The brain is the control centre of the nervous system and is located within the skull.
• The lungs.
• The liver.
• The bladder.
• The kidneys.
• The heart.
• The stomach.
• The intestines.

The world’s most spectacular organs

1. The Silvery Sound of Silbermann.
2. The U.K.’s oldest organ.
3. The world’s oldest playable pipe organ.
4. The newly-restored Royal Festival Hall organ.
5. Disney’s French fries.
6. An Italian masterpiece.
7. Birmingham’s record breaker.
8. The German ‘bird cry’ organ.

Humans have five vital organs that are essential for survival. These are the brain, heart, kidneys, liver and lungs.

The main systems of the human body are:

• Circulatory system / Cardiovascular system:
• Digestive system and Excretory system:
• Endocrine system:
• Integumentary system / Exocrine system:
• Immune system and lymphatic system:
• Muscular system:
• Nervous system:
• Renal system and Urinary system.

Your Liver: Your Coolest Organ.

Here are some of the “non-vital organs”.

• Spleen. This organ sits on the left side of the abdomen, towards the back under the ribs.
• Stomach.
• Reproductive organs.
• Colon.
• Gallbladder.
• Appendix.
• Kidneys.

their organs & functions

The 11 organ systems include the integumentary system, skeletal system, muscular system, lymphatic system, respiratory system, digestive system, nervous system, endocrine system, cardiovascular system, urinary system, and reproductive systems.