ইউনিট 11 পাঠ D

An organ is a distinct structure composed of different types of tissues that work together to perform specific functions. Organs are vital components of the body's systems and are responsible for carrying out essential physiological processes. Examples of organs in the human body include the heart, lungs, liver, kidneys, and brain. Each organ has a unique structure and function, and their coordinated activities contribute to the overall health and homeostasis of the body. Understanding the organization and function of organs is crucial for comprehending human biology and diagnosing and treating various medical conditions.

The lung refers to paired, spongy organs located in the chest cavity that play a crucial role in respiration. They are responsible for the exchange of oxygen and carbon dioxide between the air and the bloodstream, enabling the body to receive oxygen and remove waste gases. The lungs are composed of numerous air sacs called alveoli, which provide a large surface area for efficient gas exchange.

The liver is a vital organ located in the upper right abdomen responsible for numerous essential functions in the body. It plays a key role in metabolism, filtering and detoxifying harmful substances from the blood, producing bile to aid in digestion, storing vitamins and minerals, and synthesizing proteins and clotting factors. The liver is also involved in regulating blood sugar levels, storing glycogen, and producing cholesterol. Its multifunctional nature makes it crucial for maintaining overall health and well-being.

A laboratory is a controlled environment where scientific experiments, research, and practical learning activities are conducted. It is equipped with tools, instruments, and materials needed for conducting tests, measurements, or experiments. Laboratories are commonly found in schools, colleges, and universities, especially in subjects such as science, chemistry, biology, and physics. They allow students and researchers to apply theoretical knowledge in hands-on experiments, fostering a deeper understanding of scientific principles and processes.

A reporter is a journalist who gathers information, conducts interviews, and writes stories about current events or issues for newspapers, websites, television, or radio. Reporters investigate topics, verify facts, and present their findings in a clear and objective manner. They may cover a wide range of subjects, including politics, sports, crime, or entertainment. The role of a reporter is to provide accurate and timely news to the public, often working under tight deadlines. Reporters may work in the field, attending events or press conferences, or gather information remotely through research and interviews.

A teacher is someone who works primarily in a classroom setting to help students learn and develop their knowledge in specific subjects. They create lesson plans, explain concepts, and assess students' understanding through tests, assignments, and activities. Teachers are typically responsible for guiding students through a curriculum and ensuring they meet educational standards. Their role focuses on fostering academic growth and providing support to students as they learn.