What occurs when the sympathetic nervous system is stimulated?

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.

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.

This is because the anatomical position is a standard position that serves as a reference for the body. A person is said to be in anatomical position when they are standing erect with their feet together, their hands at their side, with the palms facing forward. Unless otherwise stated, most anatomical descriptions will refer to a person when in anatomical position.

Choice A is wrong because palms of the hand facing medially means that the palms are facing toward the midline of the body, which is not the case in anatomical position.

Choice B is wrong because palms of the hand facing laterally means that the palms are facing away from the midline of the body, which is also not the case in anatomical position.

Choice D is wrong because palms of the hands facing posteriorly means that the palms are facing toward the back of the body, which is opposite to the anatomical position.

The correct answer is choice B. Left ventricle. The left ventricle has the thickest wall because it pumps blood to the whole body through the aorta, which requires a lot of pressure.

The other choices are wrong because:

The normal range of wall thickness for the left ventricle is 0.6 to 1.1 cm. The normal range of wall thickness for the right ventricle is 0.3 to 0.5 cm.