Methane is the gas that can cause explosions in coal mines. Methane is a highly flammable gas, and when it accumulates in high concentrations in confined spaces like coal mines, it poses a significant risk. Methane explosions can occur if the gas comes into contact with an ignition source, such as a spark or flame, leading to a dangerous explosion. That's why proper ventilation and safety measures are crucial in coal mines to prevent methane buildup and potential explosions.

The junction between the axon of one neuron and the dendrite (or cell body) of the next neuron is called a synapse. At the synapse, electrical or chemical signals are transmitted from one neuron to another or to an effector cell, such as a muscle cell or gland cell. Synapses play a crucial role in the transmission of nerve impulses within the nervous system.

Sodium is a highly reactive element and is not found in its free state in nature due to its high reactivity. It readily reacts with other elements and compounds, forming various salts and minerals. Sodium is commonly found in the Earth's crust and in seawater as compounds, such as sodium chloride (table salt).

The term "histology" was first used by the French physician Marie François Xavier Bichat, but it was popularized and introduced into English by the Swiss anatomist Karl Wilhelm von Nägeli in the early 19th century.

The yellow color of human urine is primarily due to a pigment called urochrome. Urochrome is a waste product resulting from the breakdown of hemoglobin, a protein in red blood cells. The varying shades of yellow in urine can be influenced by factors such as hydration levels, diet, and certain medications, but urochrome is the main pigment responsible for the typical yellow color of urine.

lactic acid is one of the end products of anaerobic respiration in humans and some other organisms. During anaerobic respiration, which occurs in the absence of oxygen, glucose is partially broken down to generate energy. In the absence of oxygen, cells can convert pyruvate, a product of glycolysis, into lactic acid. This process, called lactic acid fermentation, helps generate energy in the absence of oxygen but also leads to the accumulation of lactic acid, causing muscle fatigue and soreness.

convex lenses are used in the human eye to help focus light onto the retina, allowing us to see clearly. The natural lens in the human eye is flexible and can change its shape, allowing it to adjust the focal length and focus on objects at different distances. This process is called accommodation and is essential for clear vision.