Sympathetic Nervous System and Circulation

The video tutorial covers the circulation of blood through the splanchnic and skeletal muscle systems. It explains the components of splanchnic circulation, including intestinal, hepatic, and splenic circulation, and their respective blood flow and regulation mechanisms. The tutorial also discusses skeletal muscle circulation, highlighting the role of blood flow during rest and exercise, and the impact of neural and metabolic factors on circulation.

What are the three main components of splanchnic circulation?

• Gastrointestinal, hepatic, and renal circulation

• Gastrointestinal, hepatic, and splenic circulation

• Hepatic, renal, and pulmonary circulation

• Splenic, renal, and pulmonary circulation

Which artery is the largest branch of the aorta supplying the gastrointestinal tract?

• Inferior mesenteric artery

• Hepatic artery

• Celiac artery

• Superior mesenteric artery

What effect does sympathetic stimulation have on mesenteric arteries during exercise?

• Increases blood flow to the intestines

• Decreases cardiac output

• Causes vasodilation

• Shifts blood to skeletal muscles

What is the primary source of oxygen for the liver?

• Mesenteric artery

• Splenic artery

• Hepatic artery

• Portal vein

What condition is characterized by elevated central venous pressure leading to tender hepatomegaly?

• Liver fibrosis

• Esophageal varices

• Congestive heart failure

• Portal hypertension

How does sympathetic stimulation affect the splenic circulation?

• Causes vasodilation

• Increases blood flow to the spleen

• Decreases cardiac output

• Diverts blood to systemic circulation

What percentage of cardiac output is typically directed to skeletal muscles at rest?

• 10%

• 5%

• 15%

• 20%

Which type of sympathetic fibers are responsible for vasodilation in skeletal muscles?

• Adrenergic fibers

• Cholinergic fibers

• Dopaminergic fibers

• Noradrenergic fibers

What happens to blood flow in skeletal muscles during strong sustained contraction?

• Increases significantly

• Decreases temporarily

• Remains constant

• Ceases temporarily

What condition is characterized by dilated and tortuous veins in the legs?

• Peripheral artery disease

• Deep vein thrombosis

• Varicose veins

• Raynaud's phenomenon