The Human Body - How human was form, what makes human, how is our body functioning?

How human was form, what makes human, how is our body functioning?

    Human body: A body is said to be made of different parts to form a whole of that thing presented and illustrated.

    There are three ways to study human body, and they include:

    1. Molecular/chemical (Biochemistry)

    2. Structurally (Anatomy)

    3 Functionally (physiology)

    Biochemically, the human body consists mainly of water and of organic compounds—i.e., lipids, proteins, carbohydrates, and nucleic acids. Water is found in the extracellular fluids of the body (the blood plasma, the lymph, and the interstitial fluid) and within the cells themselves.

    The body is made of:

    1. Atoms

    2. Molecule

    3. Cell

    4. Tissues

    a. Nervous tissue

    b. Connective tissue

    c. Epithelial tissue

    d. Muscle tissue

    5. Organ

    6. System

    The 11 organ systems include the

    1. integumentary system

    2. Skeletal system

    3. Muscular system

    4. lymphatic system

    5. Respiratory system

    6. Digestive system

    7. Nervous system

    8. Endocrine system, cardiovascular system, urinary system, and reproductive systems.



    You can see the heart, lungs, spleen, liver, pancreas, intestines

    Brain

    The brain is the body’s control center. It forms the core of the central nervous system by creating, sending, and processing nerve impulses, thoughts, emotions, physical sensations, and more.

    The skull encloses the brain, protecting it from injury.

    Neurologists are doctors who study the nervous system. Over time, they have identified numerous parts of the brain, including systems within the brain that function similarly to independent organs.

    The brain is made up of three main subparts: the cerebrum, the cerebellum, and the brainstem. Within these areas, there are several key components of the brain that, together with the spinal cord, comprise the central nervous system.

    The major areas of the central nervous system include:

    The medulla: This is the lowest part of the brainstem. It helps control heart and lung function.

    The pons: Located above the medulla in the brainstem, this area helps control eye and facial movement.

    The spinal cord: Extended from the base of the brain and down the center of the back, the spinal cord helps with many automatic functions, such as reflexes. It also sends messages to and from the brain.

    The parietal lobe: Situated in the middle of the brain, the parietal lobe supports the identification of objects and spatial reasoning. It also plays a role in interpreting pain and touch signals.

    The frontal lobe: The frontal lobe, which is located in the front of the head, is the largest section of the brain. It plays a role in many conscious functions, including personality and movement. It also helps the brain interpret smells.

    The occipital lobes: Positioned near the back of the brain, the occipital lobe primarily interprets vision signals.

    The temporal lobes: Located on either side of the brain, the temporal lobes play a role in numerous functions, including speech, scent recognition, and short-term memory.

    The brain’s two halves are called the right and left hemispheres. The corpus callosum connects these two hemispheres.


    Heart

    The heart is the most important organ of the circulatory system, which helps deliver blood to the body. It works with the lungs to add oxygen to blood and pump this freshly oxygenated blood through the blood vessels and around the body.


    The heart also has an electrical system within. Electrical impulses within the heart help ensure that it beats with a consistent rhythm and proper rate.


    The heart rate increases when the body needs more blood, such as during intense exercise. It decreases during times of rest.


    The heart has four chambers. The two upper chambers are called atria, and the two lower chambers are called ventricles.


    Blood flows into the right atrium from the veins of the heart and body (except the lungs), then it flows into the right ventricle. From there, it flows into the pulmonary artery, which has branches that reach the lungs. The lungs then oxygenate the blood.


    This oxygenated blood travels from the lungs, through pulmonary veins that lead back and join together, to the left atrium, and then through the left ventricle. From there, the heart pumps the blood through an artery that branches to distribute blood to itself and other body parts (except the lungs).


    The heart has four valves that ensure that blood flows in the right direction. The heart valves are:


    • the tricuspid valve
    • the pulmonary valve
    • the mitral valve
    • the aortic valve
    • the aortic valve 


    Lungs

    The lungs work with the heart to oxygenate blood. They do this by filtering the air a person breathes, then removing excess carbon dioxide in exchange for oxygen.


    Several parts of the lungs help the body take in air, filter it, and then oxygenate the blood. These are:

    The left and right bronchi: The trachea splits into these tubes, which extend into the lungs and have branches. These smaller bronchi split into even smaller tubes called bronchioles.

    The alveoli: The alveoli are tiny air sacs at the end of the bronchioles. They work like balloons, expanding when a person inhales and contracting when they exhale.

    The blood vessels: There are numerous blood vessels in the lungs for carrying blood to and from the heart.

    With extensive medical care, a person can live without one lung, but they cannot survive with no lungs.

    The diaphragm, which is a thick band of muscle directly under the lungs, helps the lungs expand and contract when a person breathes.

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