A compound is a substance made of two or more atoms bonded together.

Basal metabolic rate (BMR) refers to the energy expended by the body at rest to maintain essential physiological functions.

Flexibility refers to the range of motion around a joint, which is essential for overall movement efficiency.

Weight = mass × gravity = 10 kg × 9.8 m/s² = 98 N.

The cell membrane controls the movement of substances in and out of the cell.

Covalent bonds involve the sharing of electron pairs between atoms.

Tendons are connective tissues that connect muscles to bones.

Ciliated pseudostratified columnar epithelium is found in the lining of the respiratory tract.

The ball-and-socket joint allows for the greatest range of motion.

Ultrasound refers to sound waves with frequencies above 20,000 Hz, which are not audible to humans.

Cardiac muscle tissue is responsible for the contraction of the heart.

Type O is known as the universal donor because it can be given to any blood type.

Sensorineural hearing loss occurs due to damage to the inner ear or the auditory nerve.

Skeletal muscle is the type of muscle that is under voluntary control and is responsible for movement.

Fats provide the most energy per gram, yielding approximately 9 calories per gram, compared to carbohydrates and proteins, which provide about 4 calories per gram.

Running a marathon requires significantly more energy expenditure compared to sitting, walking, or sleeping due to the high intensity and duration of the activity.

Gases have the highest kinetic energy due to the rapid movement of their particles.

O2 (oxygen) is a diatomic molecule, consisting of two oxygen atoms.

An energy imbalance, where energy intake exceeds energy expenditure, leads to weight gain.

Air is a homogeneous mixture as its composition is uniform throughout.

H2O (water) is a molecule made of two different elements: hydrogen and oxygen.

A neutron is a neutral particle in an atom.

Gold is a pure substance as it consists of only one type of atom.

Milk is a colloid as it contains tiny particles suspended in liquid.

Oxygen is a gas at room temperature, while the others are solids or liquids.

A pure substance has a fixed composition, while a mixture has a variable composition.

Liquids have a definite volume but take the shape of their container, so they do not have a definite shape.

Energy production is not a function of the cell membrane.

Filtration can separate sand from saltwater, and evaporation can recover salt from the solution.

NaCl (sodium chloride) represents an ionic bond formed between sodium and chlorine.