Bartolomeo Cristofori

Bartolomeo Cristofori di Francesco(May 4, 1655 – January 27, 1731) was an Italian maker of musical instruments, generally regarded as the inventor of the piano.

Cristofori's pianos

Respiratory system

The respiratory system (called also respiratory apparatus, ventilatory system) is a biological system consisting of specific organs and structures used for the process of respiration in an organism. The respiratory system is involved in the intake and exchange of oxygen and carbon dioxide between an organism and the environment.

In air-breathing vertebrates like human beings, respiration takes place in the respiratory organs called lungs. The passage of air into the lungs to supply the body with oxygen is known as inhalation, and the passage of air out of the lungs to expel carbon dioxide is known as exhalation; this process is collectively called breathing orventilation. In humans and other mammals, the anatomical features of the respiratory system include trachea, bronchi, bronchioles, lungs, and diaphragm. Molecules of oxygen and carbon dioxide are passively exchanged, by diffusion, between the gaseous external environment and the blood. This exchange process occurs in the alveoli(air sacs) in the lungs.^[1]

In fish and many invertebrates, respiration takes place through the gills. Other animals, such as insects, have respiratory systems with very simple anatomical features, and in amphibians even the skin plays a vital role in gas exchange. Plants also have respiratory systems but the directionality of gas exchange can be opposite to that in animals. The respiratory system in plants also includes anatomical features such as holes on the undersides of leaves known as stomata.

DepEd Mission and Vision

The DepEd Vision

We dream of Filipinos
who passionately love their countryand whose values and competenciesenable them to realize their full potential
and contribute meaningfully to building the nation.

As a learner-centered public institution,
the Department of Education
continuously improves itself
to better serve its stakeholders.
The DepEd Mission
To protect and promote the right of every Filipino to quality, equitably,culture-based, and complete  basic education where:

• Students learn in a child-friendly, gender-sensitive, safe, and motivating environment
  
• Teachers  facilitate learning and constantly nurture every learner
• Administrators and staff, as stewards of the institution, ensure an enabling and supportive environment for 

    effective learning to happen

• Family, community, and other stakeholders  are actively engaged and share responsibility for developing 

   life-long learners