True or False
Fungiform papillae contain about 50% of the taste buds and are located at the posterior of the tongue.

A. Superior vena cava:This is a large systemic vein that returns deoxygenated blood from the upper body to the right atrium. It does not deliver oxygenated blood to abdominal viscera. It is part of the venous return, not arterial supply.

B. Thoracic duct:This is the primary vessel of the lymphatic system responsible for transporting chyle and lymph into the venous circulation. It does not carry arterial blood or supply oxygen to organs. It is involved in fat transport.

C. Coronary arteries:These vessels arise from the ascending aorta to provide oxygenated blood exclusively to the myocardium of the heart. They do not extend below the diaphragm to reach the digestive organs. They are limited to cardiac circulation.

D. Abdominal aorta:This major vessel gives rise to the celiac trunk, superior mesenteric artery, and inferior mesenteric artery. these branches provide the essential arterial supply to all abdominal digestive organs. It is the primary source of oxygenated blood.

A. Gastrin:Gastrin is primarily involved in stimulating the parietal cells to produce acid in response to gastric distension. While it has some influence on the pancreas, it is not the primary trigger for enzyme release. It is a stomach-focused hormone.

B. Secretin:The primary stimulus for secretin release is the presence of low pH (acid) in the duodenum. Its main target is the pancreatic ductal cells for bicarbonate secretion. It does not specifically target acinar cells for enzyme production.

C. Cholecystokinin (CCK):CCK is released by I cells in response to dietary fats and peptides. It acts on pancreatic acinar cells to trigger the exocytosis of digestive enzymes like lipases and proteases. It also induces gallbladder contraction for bile release.

D. Ghrelin:This hormone is involved in energy homeostasis and the initiation of feeding behavior. It does not play a role in the hormonal stimulation of pancreatic exocrine secretions during the intestinal phase. It is produced before the meal arrives.