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The human blood

The human blood

Human blood consists of blood cells and plasma.

Biology

Keywords

blood, blood flow, red blood cell, white blood cell, platelet, hemoglobin, vascular system, blood vessel, blood plasma, blood cell, body fluid, phagocytosis, connective tissue, immune defense, lymphocyte, monocyte, granulocyte, coagulation, human, biology

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Scenes

  • - They play an important role in immune defense. There are about 4-10 thousand of them per microliter (cubic millimeter) of blood. There are 3 types: Limphocytes, monocytes and granulocytes.
  • - These cells transport oxygen in the blood. It is bound by a protein called hemoglobin in their cytoplasm. There are about 5.5 million of them per cubic millimeter of blood.
  • - They are important in coagulation. They are cell fragments which do not have a nucleus. There is about 150-400 thousand of them per cubic millimeter of blood.

  • - There are about 4.5-5.5 million of these cells in a cubic millimeter of blood. Their cytoplasm contains hemoglobin, which binds oxygen. They do not have a nucleus, their size is about 7 μm.

  • - The two main, functionally different types of lymphocites are B and T lymphocites. B lymphocites (also called B cells) produce antibodies that neutralise pathogens. T lymphocytes (or T cells) destroy virally infected cells and tumor cells.
  • - They play an important role in the defense against parasites. The granules found in them appear red after staining with hematoxylin and eosin.

  • - They are important in coagulation. They are cell fragments which do not have a nucleus. There is about 150-400 thousand of them per cubic millimeter of blood.

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Circulatory system

Systemic circulation carries oxygenated blood from the heart to the body, while pulmonary circulation carries oxygenated blood from the lungs to the heart.

Effects of smoking on the lungs

Smoking severely damages the respiratory system, it may cause COPD or lung cancer.

Endocrine system

Glands of the endocrine system secrete hormones into the blood.

Respiratory system

The respiratory system is responsible for the intake of oxygen and the release of carbon dioxide.

The heart

The heart is the central pump of the cardiovascular system beating several billion times over our lifetime.

Heart attack

The cause of a heart attack is the blockage of a coronary artery. It is one the most common causes of death.

Lymphatic system

Lymph vessels carry lymph to the blood vessels, while lymph nodes are integral parts of the immune system.

Blood vessels

The three main types of blood vessels in the human body are the arteries, the veins, and the capillaries.

Connective tissues

Connective tissues include loose and dense connective tissues, adipose tissue, blood, tendon and bone tissue.

Deep vein thrombosis and pulmonary embolism

A blood clot that forms in the deep veins of the lower limbs can cause a fatal pulmonary embolism if they enter the lungs.

Hemoglobin

Oxygen carrier protein in our red blood cells.

Hypothalamic-pituitary axis

The Hypothalamic-pituitary axis is the regulating center of our endocrine system.

Muscle tissues

The three types of muscle found in the human body are the smooth, the striated and the cardiac muscle.

Neurons, nervous tissue

Neurons are cells specialized for transmitting electric signals.

Secondary structure of proteins

Polypeptide chains are composed of amino acids and can appear in alpha-helix or beta-sheet form.

Structure of proteins

The structure and arrangement of polypeptide chains affects the spatial structure of proteins.

The bones of the thorax

The ribs, the sternum and the spinal column form the skeleton of the chest.

The electrical conduction system of the heart

The heart generates the electrical impulses necessary for its own operation. The graphic representation of the electrical activity of the heart is the...

The Human Body - for Kids

This scene summarizes the main organs of the human body.

Types of surface epithelium

Surface epithelia cover the external and internal surfaces of the body

What is the human body composed of?

This scene presents the basic components of the human body.

Carbon dioxide (CO₂) (intermediate)

Colorless, odorless, heavier-than-air gas. Necessary for the photosynthesis of plants.

Oxygen (O₂) (intermediate)

A colorless, odorless gas, an important component of the atmosphere, indispensable to sustain terrestrial life.

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