Which hand position describes the anatomical position of a person who is standing erect with feet forward?.

 

The correct answer is choice D. Dermal papillae. Dermal papillae are the projections of the dermis that create the ridges and grooves on the surface of the skin, which are responsible for fingerprints.

Choice A is wrong because Merkel cells are touch receptor cells located at the tip of the epidermal ridges, not the dermal papillae.

Choice B is wrong because arrector pili are smooth muscles attached to hair follicles, which cause goose bumps when contracted, not fingerprints.

Choice C is wrong because sudoriferous glands are sweat glands that secrete fluid onto the skin surface, not fingerprints.

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.

Digestion begins in the mouth, where the teeth break down the food and the saliva contains enzymes that start to break down carbohydrates. This process is called ingestion.

Choice A is wrong because the esophagus is a thin tube that connects the mouth to the stomach. It does not digest food, but moves it through peristalsis, which are wave-like contractions of the muscles in the gut wall.

Choice C is wrong because the stomach is a muscular bag that mixes food with acid and enzymes. It does not start digestion, but continues it, especially for proteins.

Choice D is wrong because the small intestine is where most of the digestion and absorption of nutrients takes place. It receives enzymes and bile from the pancreas and liver, which help to break down carbohydrates, proteins and lipids.

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.