CLASS X BIOLOGY CHAPTER:LIFE PROCESSES : Photosynthesis (Light Reactions)

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                                  SOURCE:  http://www.youtube.com/watch?v=hj_WKgnL6MI

Human Digestive System

Amazing to know how our body's digestive system works everyday. Check out the video:

ASTHMA a respiratory disease

Asthma is a chronic lung disease characterized by chest tightness, shortness of breath, coughing and wheezing.  With asthma, a blockage of airflow in and out of the lungs occurs from muscle squeezing, swelling and excess mucous.  Between 12-15 million people in the United States have asthma, including up to 5 million children.
Physicians who are not specialists in this disease may mistake its symptoms for an infection, unaware that the underlying problem is asthma.  Asthma is characterized by three airway problems:  obstruction, inflammation and hyper responsiveness.  Asthma patients respond to environmental factors differently than non-asthmatics.  In response to a trigger, the asthmatic's airways become narrowed and inflamed, which results in wheezing, coughing and tightness in the chest.  If you have asthma, you can minimize symptoms by avoiding these triggers, and by working with your doctor to develop an effective plan for treatment.

Triggers for Asthma

Asthmatic symptoms can be triggered by several factors, including:

• Allergens or irritants
• Exercise
• Medications or foods
• Viral or sinus infections
• Reflux disease
• Emotional anxiety

Managing Asthma

Because asthma is a chronic disease, it requires careful monitoring and effective treatment.  The treatment of asthma has four main components

• The use of objective measures of lung functions to assess the severity of asthma and to monitor treatment (peak flow meters and spirometers)
• Environmental control measure to avoid or eliminate factors that trigger asthma symptoms or flare-ups
• Medication therapy for long-term management to reverse and prevent airway inflammation as well as therapy to manage asthma flare-ups
• Patient education to foster a partnership between the patient, his family and the physician

According to the Guidelines, there are six goals for the effective management of asthma:

• Prevent chronic and troublesome symptoms
• Maintain (near) ?normal? breathing
• Maintain normal activity levels, including exercise
• Prevent recurrent asthma flare-ups, and minimize the need for emergency room visits or hospitalizations
• Provide optimal medication therapy with no or minimal adverse effects
• Meet patients' and families' expectations of satisfactory asthma care

With proper diagnosis, monitoring and treatment, individuals with asthma can engage in regular physical activity and can live normal healthy lives.

For more information

Contact the American Academy of Allergy, Asthma and Immunology

TEXT SOURCE: http://www.healthchecksystems.com/asthma.htm
VIDEO SOURCE: http://www.youtube.com/watch?v=7EDo9pUYvPE

CLASS X BIOLOGY CHAPTER: LIFE PROCESSES... Working of our body during respiration...........

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SOURCE:- http://www.youtube.com/watch?feature=player_embedded&v=o2OcGgJbiUk#!

CLASS X BIOLOGY CHAPTER: LIFE PROCESSES...

LIFE PROCESSES : RESPIRATION

In physiology, respiration (often confused with breathing) is defined as the transport of oxygen from the outside air to the cells within tissues, and the transport of carbon dioxide in the opposite direction. This is in contrast to the biochemical definition of respiration, which refers to cellular respiration: the metabolic process by which an organism obtains energy by reacting oxygen with glucose to give water, carbon dioxide and ATP (energy). Although physiologic respiration is necessary to sustain cellular respiration and thus life in animals, the processes are distinct: cellular respiration takes place in individual cells of the organism, while physiologic respiration concerns the bulk flow and transport of metabolites between the organism and the external environment.

In unicellular organisms, simple diffusion is sufficient for gas exchange: every cell is constantly bathed in the external environment, with only a short distance for gases to flow across. In contrast, complex multicellular animals such as humans have a much greater distance between the environment and their innermost cells, thus, a respiratory system is needed for effective gas exchange. The respiratory system works in concert with a circulatory system to carry gases to and from the tissues

ORGAN       OXYGEN CONSUMPTION(ml Oxygen/min per 100 g)

Heart(rest)                                  8

Heart(heavy exercise)                 70

Brain                                           3

Kidney                                        5

Skin                                           0.2

Resting skeletal muscle               1

Contracting skeletal muscle        50



src :http://en.wikipedia.org/wiki/Respiration_(physiology)

Human Circulatory System!

Human Circulatory System