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

 

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 correct answer is choice D. Water is reabsorbed from the urinary filtrate. This is because ADH (antidiuretic hormone) increases the permeability of the cells in the collecting tubules to water, allowing more water to be reabsorbed back into the bloodstream and reducing urine volume.

Choice A is wrong because large quantities of dilute urine are formed when ADH is low or absent, not when it is secreted.

Choice B is wrong because the tubules become more permeable to water, not imper

Red bone marrow is the site of blood production in infants after birth. Red bone marrow is found in the spongy tissue of some bones, such as the sternum, ribs, pelvis, and vertebrae.

Choice B is wrong because red pulp in the spleen is involved in filtering and recycling old red blood cells, not producing new ones.

Choice C is wrong because the heart is not a site of blood production, but a pump that circulates blood throughout the body.

Choice D is wrong because sinusoids of the liver are enlarged capillaries that allow blood to flow from the portal vein to the hepatic vein. They are not involved in blood production

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.