What prevents food from entering the trachea during swallowing?

A. Ribosome: Ribosomes are responsible for protein synthesis by translating mRNA into amino acid sequences. They do not produce energy for the cell.

B. Nucleus: The nucleus stores genetic material and regulates cellular activities by controlling gene expression. It does not generate cellular energy directly.

C. Golgi apparatus: The Golgi apparatus modifies, sorts, and packages proteins and lipids for transport within or outside the cell. It is not involved in energy production.

D. Mitochondria: Mitochondria are the “powerhouses” of the cell, generating ATP through cellular respiration. They convert nutrients like glucose and fatty acids into usable energy to fuel cellular functions.

A. Chemoreceptors: Chemoreceptors detect chemical changes in the environment, including molecules responsible for taste and smell. They convert chemical stimuli into nerve impulses that the brain interprets as specific flavors or odors.

B. Mechanoreceptors: Mechanoreceptors respond to mechanical pressure or distortion, such as touch, vibration, and sound. They are not involved in detecting chemical stimuli like taste or smell.

C. Photoreceptors: Photoreceptors are specialized cells in the retina that respond to light. They enable vision but do not respond to chemical stimuli in the environment.

D. Thermoreceptors: Thermoreceptors detect changes in temperature, such as heat or cold, and send signals to the brain to regulate body temperature. They are not sensitive to chemical molecules involved in taste or smell.