Why human beings are considered

complex organisms?

“GROUP 5”

TYPE OF CELLS, ORGANS AND SYSTEM IN A HUMAN BODY

Human is a complex organisms because humans are made up of trillion of cell and a lot of system and

organ .Some of the major systems are blood circulatory systems, the skeletal system, the

digestive system, the nervous system and the respiratory system. Most of which are grouped into

organ systems that have specialised functions.

ORGANISATION IN HUMAN BODY

CELL ORGANIZATION IN HUMAN

Humans are unique among Earth’s life forms as they have language and thought, a better developed

brain, able to create and learn from experience and endowed with intelligence which enables them to

think and reason rationally.

STRUCTURE AND FUNTION

OF CELL , TISSUE , SYSTEM

AND ORGAN

Cell Cells group

together in the body to form

tissues

Type of human cell Structure Respective function

Red Blood Cell Biconcave shape

Transports vital food and oxygen to all parts of the body.

White blood cell

Protects the body from damage by invaders

Nerve cell Carries messages in the form of electrical impulses around the body.

Bone cell Form bones to support the body and protect organs.

Epithelial cell It protects the internal and external parts of the body.

Muscle cell Contracts and relaxes to move parts of the body.

CELL

Human sperm cell

Takes part in fertilization to produce young ones.

Human egg cell (ova)

If the egg is fertilized it will develop into an embryo.

tissue A collection of similar cells that

group together to perform a specialized function.  There are 4 primary tissue types in the human body: epithelial tissue, connective tissue, muscle tissue and nerve tissue.

• The cells of epithelial tissue pack tightly together and form continuous sheets that serve as linings in different parts of the body. Epithelial tissue serve as membranes lining organs and helping to keep the body's organs separate, in place and protected. Some examples of epithelial tissue are the outer layer of the skin, the inside of the mouth and stomach, and the tissue surrounding the body's organs.

Epithelial Tissue

Epithelial Tissue

Connective Tissue

• There are many types of connective tissue in the body. Generally speaking, connective tissue adds support and structure to the body. Most types of connective tissue contain fibrous strands of the protein collagen that add strength to connective tissue. Some examples of connective tissue include the inner layers of skin, tendons, ligaments, cartilage, bone and fat tissue. In addition to these more recognizable forms of connective tissue, blood is also considered a form of connective tissue.

Connective Tissue

• Muscle tissue is a specialized tissue that can contract. Muscle tissue contains the specialized proteins actin and myosin that slide past one another and allow movement. Examples of muscle tissue are contained in the muscles throughout your body.

Muscle Tissue

Muscle Tissue

Nerve Tissue

• Nerve tissue contains two types of cells: neurons and glial cells. Nerve tissue has the ability to generate and conduct electrical signals in the body. These electrical messages are managed by nerve tissue in the brain and transmitted down the spinal cord to the body.

Nerve Tissue

Organs• Organs are the next level of

organization in the body. An organ is a structure that contains at least two different types of tissue functioning together for a common purpose. There are many different organs in the body: the liver, kidneys, heart, even your skin is an organ.

• In fact, the skin is the largest organ in the human body and provides us with an excellent example for explanation purposes. The skin is composed of three layers: the epidermis, dermis and subcutaneous layer. The epidermis is the outermost layer of skin.

• It consists of epithelial tissue in which the cells are tightly packed together providing a barrier between the inside of the body and the outside world. Below the epidermis lies a layer of connective tissue called the dermis. In addition to providing support for the skin, the dermis has many other purposes.

• The dermis contains blood vessels that nourish skin cells. It contains nerve tissue that provides feeling in the skin. And it contains muscle tissue that is responsible for giving you 'Goosebumps' when you get cold or frightened. The subcutaneous layer is beneath the dermis and consists mainly of a type of connective tissue called adipose tissue. Adipose tissue is more commonly known as fat and it helps cushion the skin and provide protection from cold temperatures.

System

Organ systems are composed of two or more different organs that work together to provide a common function.  There are 10 major organ systems in the human body, they are the:

VARIOUS SYSTEM IN HUMAN BODY The Endocrine System~Produces, stores and secretes chemical substances known as hormones. The Skeletal System~ Protect internal organ and Provides body support The Lymphatic System~ Body‘s defenses against infection The Reproductive System~ For reproduction The Muscular System~ Enables body movement.

The Nervous System~Detect stimuli and responds to them. The Blood Circulatory System~Supplies the cells of the body with the food.~Transport waste product. The Respiratory System~Supplies oxygen and aids removing of carbon dioxide The Digestive System~ Processes food(ingestion, digestion, absorption). The Excretory System~ Removes waste products from body.

The Endocrine system

The Skeletal System

The Lymphatic System

The Reproductive System

The Muscular System

The Nervous System

The Blood Circulatory System

The Respiratory System

The Digestive System

The Excretory System

FUNCTIONS OF SYSTEM IN A HUMAN BODY.

These systems can best be understood in terms of the essential functions they serve, deriving energy

from food, protection against injury, internal coordination and reproduction.

Human Is a Complex Organism

REMEMBER THAT

THANK YOU!!!!!

“THE END”