What Are The 4 Main Parts Of The Body?

What is the most useless body part?

appendixThe appendix may be the most commonly known useless organ.

While plant-eating vertebrates still rely on their appendix to help process plants, the organ is not part of the human digestive system..

What is the strongest muscle in the human body?

masseterThe 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. The uterus sits in the lower pelvic region.

Which organ of the body works 24 hours?

At night when we sleep, the brain takes our consciousness offline so it can start its real work: sorting through the day’s information, storing the important parts, and cleaning out the gunk that accumulated. The brain is so well-designed, in fact, that we hardly even notice when it’s breaking down.

What are the 4 major parts of the body?

The basic parts of the human body are the head, neck, torso, arms and legs.

What is the main part of woman?

Female anatomy includes the external genitals, or the vulva, and the internal reproductive organs, which include the ovaries and the uterus. One major difference between males and females is their reproductive organs. Anatomy specific to females generally relates to sexual function, reproduction, and hormone control.

What organs can you live without?

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.

Where is kidney located in our body?

There are two kidneys, each about the size of a fist, located on either side of the spine at the lowest level of the rib cage. Each kidney contains up to a million functioning units called nephrons.

What is the smallest organ in the body?

What’s the smallest organ in the human body? You’ll find the pineal gland near the center of the brain, in a groove between the hemispheres. It’s not an organ like those in the abdominal cavity.

What body part is the most important?

The brain is arguably the most important organ in the human body. It controls and coordinates actions and reactions, allows us to think and feel, and enables us to have memories and feelings—all the things that make us human.

What’s the weakest muscle in your body?

stapediusThe stapedius is the smallest skeletal muscle in the human body. At just over one millimeter in length, its purpose is to stabilize the smallest bone in the body, the stapes….Stapedius muscle.StapediusTA22103FMA49027Anatomical terms of muscle12 more rows

Is blood an organ?

Blood is both a tissue and a fluid. It is a tissue because it is a collection of similar specialized cells that serve particular functions. These cells are suspended in a liquid matrix (plasma), which makes the blood a fluid.

What are the main parts of the body?

The three main parts of the body are: the head, the trunk and the limbs (extremities). The head is composed of the cranial and facial parts. It contains the brain, the centre of the nervous system.

How many parts are in the body?

According to anatomy studies [50], human body parts can be divided into nine different parts by position: the head, neck, chest, abdomen, pelvis, back, hip, extremity, and trunk. In our ontology, the nine anatomical positions are regarded as the top level.

What is the largest organ in your body?

Skin is the human body’s largest organ. Body organs aren’t all internal like the brain or the heart. There’s one we wear on the outside. Skin is our largest organ—adults carry some 8 pounds (3.6 kilograms) and 22 square feet (2 square meters) of it.

Which is the hardest substance of our body?

Tooth enamel1. Tooth enamel is the hardest substance in the body. The shiny, white enamel that covers your teeth is even stronger than bone.

What are the 12 organs of the body?

They are the integumentary, skeletal, muscular, nervous, endocrine, cardiovascular, lymphatic, respiratory, digestive, urinary, and reproductive systems. Only the reproductive system varies significantly between males and females.