Anaerobic respiration can lead to a burning sensation caused by which molecule?. A. Adenosine triphosphate (ATP).

The popliteal pulse is located at the back of the knee over the popliteal artery. This artery is an extension of the femoral artery and supplies blood to the lower parts of the leg, foot and ankle.

Choice A is wrong because the dorsalis pedis pulse is located on the top of the foot over the dorsalis pedis artery.

Choice B is wrong because the femoral pulse is located in the groin area over the femoral artery.

Choice D is wrong because the posterior tibial pulse is located on the inner side of the ankle over the posterior tibial artery.

The correct answer is choice B. Ear wax.

Ceruminous glands are specialized sweat glands that are located in the external auditory canal.

They secrete a waxy substance called cerumen or ear wax by mixing their secretion with sebum and dead epidermal cells. Cerumen helps to protect the ear from physical damage and infection.

Choice A is wrong because sebum is secreted by sebaceous glands, not ceruminous glands. Sebum is an oily substance that lubricates and protects the hair and skin.

Choice C is wrong because mucus is secreted by mucous glands, not ceruminous glands. Mucus is a slippery substance that moistens and protects the inner lining of various organs.

Choice D is wrong because keratin is not a secretion, but a protein that forms the structure of hair, nails and skin.

When the sympathetic nervous system is stimulated, it prepares the body for a fight-or-flight response by increasing the heart rate and blood pressure, which results in increased cardiac output.

Cardiac output is the amount of blood pumped by the heart per minute.

Choice B is wrong because increased pancreatic activity is not a result of sympathetic stimulation. The sympathetic nervous system inhibits digestion and reduces blood flow to the gastrointestinal tract.

Choice C is wrong because increased uterine activity is not a result of sympathetic stimulation. The sympathetic nervous system relaxes the smooth muscles of the uterus and other reproductive organs.

Choice D is wrong because increased gastrointestinal activity is not a result of sympathetic stimulation. The sympathetic nervous system inhibits digestion and reduces blood flow to the gastrointestinal tract.

The correct answer is choice B. Ear. The malleus, incus, and stapes are the three smallest bones in the body and they are located in the middle ear.

They are also called the auditory ossicles or ear bones. They transmit vibrations of the tympanic membrane (eardrum) to the oval window of the inner ear, where they are converted into electrical signals by the cochlea.

Choice A. Mouth is wrong because the mouth does not contain any bones, only teeth and soft tissues.

Choice C. Skull is wrong because the skull is a large bony structure that encloses the brain and the ear, but it does not house the malleus, incus, and stapes. The auditory ossicles are located inside a small cavity in the temporal bone called the tympanic cavity.

Choice D. Lungs is wrong because the lungs are organs of respiration that do not have any bones or connection to the ear.