An Presentation to the Hominal Body

Structural Formation of the Human Trunk

Eruditeness Objectives

By the end of this subdivision, you will be able to:

  • Account the structure of the earthborn torso in price of cardinal levels of organization
  • Name the eleven electric organ systems of the human body and identify leastways incomparable organ and cardinal major function of each

Before you begin to study the different structures and functions of the form, it is accommodating to consider its BASIC computer architecture; that is, how its smallest parts are assembled into larger structures. It is accessible to consider the structures of the body in terms of fundamental levels of organization that increase in complexness: microscopical particles, atoms, molecules, organelles, cells, tissues, variety meat, organ systems, organisms and biosphere ((Figure)).

Levels of Structural Organization of the Human Trunk

The organization of the body oftentimes is discussed in damage of six distinct levels of flaring complexness, from the smallest material building blocks to a unique human organism.

This illustration shows biological organization as a pyramid. The chemical level is at the apex of the pyramid where atoms bond to form molecules with three dimensional structures. An example is shown with two white hydrogen atoms bonding to a red oxygen atom to create water. The next level down on the pyramid is the cellular level, as illustrated with a long, tapered, smooth muscle cell. At this level, a variety of molecules combine to form the interior fluid and organelles of a body cell. The next level down is the tissue level. A community of similar cells forms body tissue. The example given here is a section of smooth muscle tissue, which contains many smooth muscle cells closely bound side by side. The next level down is the organ level, as illustrated with the bladder and urethra. The bladder contains smooth muscle while the urethra contains skeletal muscle. These are both examples of muscle tissues. The next level down is the organ system level, as illustrated by the entire urinary system containing the kidney, ureters, bladder and urethra. At this level, two or more organs work closely together to perform the functions of a body system. At the base of the pyramid is the organismal level illustrated with a woman drinking water. At this level, many organ systems work harmoniously together to perform the functions of an independent organism.

The Levels of Organization

To study the chemical level of organization, scientists study the simplest edifice blocks of affair: microscopical particles, atoms and molecules. All matter in the universe is composed of one or more unique pure substances called elements, familiar examples of which are hydrogen, oxygen, carbon, nitrogen, atomic number 20, and iron. The smallest social unit of some of these staring substances (elements) is an atom. Atoms are made up of subatomic particles much as the proton, negatron and neutron. Two or more atoms combine to form a molecule, such as the water molecules, proteins, and sugars found in sustenance things. Molecules are the chemical substance building blocks of all body structures.

A cell is the smallest independently functioning unit of a living organism. Even bacteria, which are extremely small, severally-living organisms, have a cellular structure. To each one bacterium is a single cell. All living structures of human anatomy contain cells, and almost all functions of human physiology are performed in cells operating theatre are initiated by cells.

A human cell typically consists of negotiable membranes that hold in cytoplasm, a water-based cellular fluid together with a variety of diminutive functioning units called organelles. In human race, A all told organisms, cells perform all functions of life. A tissue is a group of many similar cells (though sometimes self-possessed of a few related types) that work jointly to perform a specific function. An harmonium is an anatomically distinct structure of the body composed of two or more tissue types. Each organ performs one or more specific physiologic functions. An organ system is a group of organs that work jointly to do major functions or meet physical needs of the body.

This book covers eleven distinct organ systems in the human body ((Figure) and (Figure)). Assignment organs to reed organ systems fanny be imprecise since variety meat that "lie" to matchless system can also have functions integral to another organization. In fact, most organs contribute to more than one system.

Organ Systems of the Chassis

Organs that work together are grouped into pipe organ systems.

This illustration shows eight silhouettes of a human female, each showing the components of a different organ system. The integumentary system encloses internal body structures and is the site of many sensory receptors. The integumentary system includes the hair, skin, and nails. The skeletal system supports the body and, along with the muscular system, enables movement. The skeletal system includes cartilage, such as that at the tip of the nose, as well as the bones and joints. The muscular system enables movement, along with the skeletal system, but also helps to maintain body temperature. The muscular system includes skeletal muscles, as well as tendons that connect skeletal muscles to bones. The nervous system detects and processes sensory information and activates bodily responses. The nervous system includes the brain, spinal cord, and peripheral nerves, such as those located in the limbs. The endocrine system secretes hormones and regulates bodily processes. The endocrine system includes the pituitary gland in the brain, the thyroid gland in the throat, the pancreas in the abdomen, the adrenal glands on top of the kidneys, and the testes in the scrotum of males as well as the ovaries in the pelvic region of females. The cardiovascular system delivers oxygen and nutrients to the tissues as well as equalizes temperature in the body. The cardiovascular system includes the heart and blood vessels.

Organ Systems of the Human Body (continued)

Organs that work together are grouped into organ systems.

The lymphatic system returns fluid to the blood and defends against pathogens. The lymphatic system includes the thymus in the chest, the spleen in the abdomen, the lymphatic vessels that spread throughout the body, and the lymph nodes distributed along the lymphatic vessels. The respiratory system removes carbon dioxide from the body and delivers oxygen to the blood. The respiratory system includes the nasal passages, the trachea, and the lungs. The digestive system processes food for use by the body and removes wastes from undigested food. The digestive system includes the stomach, the liver, the gall bladder (connected to the liver), the large intestine, and the small intestine. The urinary system controls water balance in the body and removes and excretes waste from the blood. The urinary system includes the kidneys and the urinary bladder. The reproductive system of males and females produce sex hormones and gametes. The male reproductive system is specialized to deliver gametes to the female while the female reproductive system is specialized to support the embryo and fetus until birth and produce milk for the infant after birth. The male reproductive system includes the two testes within the scrotum as well as the epididymis which wraps around each testis. The female reproductive system includes the mammary glands within the breasts and the ovaries and uterus within the pelvic cavity.

The organism level is the highest level of organization. An organism is a living being that has a cellular structure and that lavatory independently do all physiologic functions necessary for life. In multicellular organisms, including humans, all cells, tissues, organs, and organ systems of the body do work together to hold out the life and wellness of the organism.

Chapter Review

Life processes of the soma are maintained at single levels of structural organization. These include the chemical, cellular, tissue, harmonium, electronic organ arrangement, and the being level. Higher levels of constitution are built from lower levels. Hence, molecules combine to form cells, cells combine to form tissues, tissues corporate trust to form organs, organs flux to form organ systems, and organ systems combine to form organisms.

Review Questions

The smallest independently functioning building block of an organism is a(n) ________.

  1. cell
  2. molecule
  3. Hammond organ
  4. weave

A compendium of similar tissues that performs a specific function is an ________.

  1. organ
  2. organelle
  3. organism
  4. organ system

The body system responsible structural support and apparent motion is the ________.

  1. cardiovascular system
  2. endocrine system
  3. athletic organization
  4. skeletal system

Acute THINKING QUESTIONS

Name the six levels of formation of the fallible body.

Material, cellular, tissue, organ, organ organization, being.

The female ovaries and the male testes are a part with of which trunk system? Can these organs be members of more than one pipe organ system? Why Beaver State why not?

The female ovaries and the manful testes are parts of the reproductive system. But they also secrete hormones, as does the endocrine system, therefore ovaries and testes function within both the endocrine and reproductive systems.

Glossary

cell
smallest severally functioning unit of all organisms; in animals, a cell contains cytoplasm, equanimous of graceful and organelles
organ
functionally distinct structure self-possessed of ii or more types of tissues
organ system
group of variety meat that bring up together to contain out a particular proposition operate
being
living being that has a living thing structure and that can independently perform every physiologic functions necessary for living
tissue
radical of analogous or closely affiliated cells that act together to perform a particularized function

groups of similar cells that perform specific tasks makeup

Source: https://opentextbc.ca/anatomyandphysiologyopenstax/chapter/structural-organization-of-the-human-body/