Explanation

Emphysema is a condition in which the alveoli at the end of the smallest air passages (bronchioles) of the lungs are destroyed.

Due to damaging exposure to cigarette smoke and other irritating gases and particulate matter.

Explanation

When CO2 levels in the blood increase, it triggers a response in the brain's respiratory centers to increase the rate of breathing.

This is because high CO2 levels indicate that the body is producing more waste products and needs to expel them through exhalation.

Explanation

The larynx (voice box) is located on top of the trachea (windpipe), which is a tube that leads to the lungs.

The larynx sits at the junction of the pharynx (throat) and the trachea, and it plays a crucial role in speech and breathing.

Explanation

Inspiration, or inhalation, involves the contraction of two main muscle groups:

Diaphragm: a dome-shaped muscle that separates the chest cavity from the abdominal cavity.

When it contracts, it flattens and increases the volume of the chest cavity.

Intercostal muscles: muscles located between the ribs.

When they contract, they pull the ribs outward and upward, increasing the volume of the chest cavity.

Explanation

A respiratory surface, such as the alveoli in lungs or the surface of gills, possesses the following properties:

• Thin: allows for efficient gas exchange
• Wet: facilitates the exchange of gases between the surface and the surrounding environment
• Permeable: allows gases to pass through the surface
• Very large: provides a large surface area for gas exchange to occur

Explanation

Each stoma (singular of stomata) is formed by two guard cells, which are specialized cells that surround the stoma and control its opening and closing.

The guard cells swell or shrink to adjust the aperture of the stoma, regulating gas exchange and transpiration in plants.

Explanation

Plants exchange gases through:

• Roots: absorb oxygen and release carbon dioxide through small openings called root hairs
• Stomata (singular: stoma): tiny openings on leaf surfaces that allow for gas exchange (CO2 in, O2 out)
• Stem: some plants have aerial roots or stem cuticles that allow for gas exchange

Explanation

Gaseous exchange refers to the exchange of gases between an organism and its environment.

Both photosynthesis and respiration involve gaseous exchange:

• Photosynthesis: takes in carbon dioxide (CO2) and releases oxygen (O2)
• Respiration: takes in oxygen (O2) and releases carbon dioxide (CO2)

Explanation

• When one atom loses an electron to form a cation and another atom gains that electron to form an anion, the resulting attraction between the oppositely charged ions is an ionic bond.
• This type of bond is typically formed between a metal and a nonmetal, and is characterized by a transfer of electrons rather than a sharing of electrons (as in covalent bonds).

Explanation

• Ethyl alcohol was prepared by Al-Razi (also known as Rhazes).
• He was a Persian polymath who made significant contributions to chemistry and medicine, including the distillation of alcohol.