The nervous system consists of the brain, spinal cord, and nerves. However, the heart is not a component of the nervous system. The heart is part of the circulatory system, which is responsible for pumping blood throughout the body.

White blood cells play a crucial role in the immune system. Their primary function is to fight off infections and foreign substances such as bacteria, viruses, and other pathogens. They help protect the body from illness and help in the healing process.

The unit of measurement for electric current is the ampere (A). It represents the rate of flow of electric charge in a circuit. Watts (W) measure power, volts (V) measure electric potential difference, and ohms (Ω) measure resistance.

Nephrons are the functional units of the kidneys. They filter waste products, excess water, and other substances from the blood to produce urine, which is then excreted from the body. The regulation of blood sugar levels is primarily done by the pancreas, and the production of red blood cells occurs in the bone marrow.

The process by which plants convert sunlight, water, and carbon dioxide into glucose and oxygen is called photosynthesis. This process occurs in the chloroplasts of plant cells, where sunlight is absorbed by chlorophyll and used to convert carbon dioxide and water into glucose and oxygen.

An endothermic reaction is a reaction that absorbs heat energy from the surroundings. Burning paper, formation of rust, and mixing an acid and a base are examples of exothermic reactions where heat is released. Dissolving ammonium nitrate in water is an example of an endothermic reaction as it absorbs heat from the surroundings.

A chemical change involves the formation of a new substance with different properties. Changes in color, state of matter, and the formation of a new substance are all characteristics of a chemical change. However, a chemical change often involves a change in energy, either releasing or absorbing it.

Sublimation is the process by which a solid changes directly into a gas without passing through the liquid state. This occurs when the substance’s vapor pressure exceeds the atmospheric pressure at a given temperature.

Nucleic acids, such as DNA and RNA, are responsible for carrying genetic information in cells. They contain the instructions necessary for the development, functioning, and reproduction of all living organisms.

Solar power is an example of a renewable energy source because it harnesses energy from the sun, which is an abundant and continuously available resource. Natural gas, coal, and petroleum are non-renewable sources.

The liver has several important functions in the human body, and one of them is filtering blood. It helps remove toxins, metabolic waste products, and drugs from the bloodstream, ensuring the blood remains clean and healthy.

An atom is the smallest unit of an element that still retains the properties of that element. Atoms are composed of a nucleus containing protons and neutrons, surrounded by electrons.

The principle that states that the total energy of an isolated system remains constant over time is known as the Law of Conservation of Energy. According to this law, energy cannot be created or destroyed but can only be converted from one form to another.

The primary function of the respiratory system in humans is to transport oxygen to body cells and eliminate carbon dioxide from the body. This is achieved through the process of breathing, where oxygen is inhaled into the lungs and carbon dioxide is exhaled.

Homeostasis is the term for the ability of an organism to maintain a stable internal environment despite changes in the external environment. It allows the organism to regulate factors such as temperature, pH, and nutrient levels to ensure optimal functioning.

Diffraction is the phenomenon where light waves bend and spread out as they pass through an opening or around an obstacle. It is commonly observed when light passes through a narrow slit or around the edges of an object.

The ozone layer in the Earth’s atmosphere plays a crucial role in protecting life on Earth by absorbing most of the sun’s harmful ultraviolet (UV) radiation, which can cause skin cancer and other health problems.

Density = Mass ÷ Volume. Density is the measure of how much mass is contained within a given volume. It is calculated by dividing the mass of an object by its volume.

Sublimation is the process in which a solid directly changes into a gas without going through the liquid state. An example of sublimation is dry ice (solid carbon dioxide) turning into carbon dioxide gas.

Electronegativity is a measure of an atom’s tendency to attract electrons towards itself in a chemical bond. Oxygen has a higher electronegativity compared to sodium, chlorine, and carbon.

Nitrogen is not considered a greenhouse gas. Greenhouse gases, such as carbon dioxide, methane, and water vapor, trap heat in the Earth’s atmosphere, contributing to the greenhouse effect and climate change.

An exothermic reaction is a chemical reaction that releases energy in the form of heat. Burning wood is an example of an exothermic reaction because it releases heat and light as it reacts with oxygen.

Proxima Centauri b is an example of an exoplanet. Exoplanets are planets that orbit stars outside our solar system. Proxima Centauri b is the closest known exoplanet to Earth and orbits the star Proxima Centauri.

A synthesis reaction, also known as a combination reaction, occurs when two or more substances combine to form a new compound. It is typically represented by the following general equation: A + B → AB.

The process by which a cell divides into two identical daughter cells is called mitosis. During mitosis, the genetic material of the cell is duplicated and evenly distributed to the daughter cells.

Mitochondria are known as the powerhouses of the cell because they are responsible for producing energy in the form of adenosine triphosphate (ATP) through cellular respiration.