Bile from the liver and digestive juices from the pancreas enter which section of the small intestine?
Sigmoid colon
Duodenum
Cecum
Ilium
Jejunum
The Correct Answer is B
A. Sigmoid colon: This S-shaped segment constitutes the terminal portion of the large intestine, leading to the rectum. Its primary physiological role involves fecal dehydration and storage rather than enzymatic digestion. It is located too distally in the gastrointestinal tract to receive primary biliary or pancreatic secretions.
B. Duodenum: This proximal segment of the small intestine receives chyme from the stomach through the pylorus. The hepatopancreatic ampulla opens into this region, delivering bile and pancreatic enzymes to facilitate lipid emulsification and chemical proteolysis. It serves as the primary site for neutralizing gastric acid.
C. Cecum: This pouch represents the commencement of the large intestine and receives undigested material from the ileum. It is primarily involved in the absorption of remaining fluids and salts. It lacks the anatomical connections required to receive direct secretions from the liver or the pancreas.
D. Ilium: This terminal section of the small intestine focuses on the absorption of vitamin B12 and bile salts. While it is part of the small intestine, it is located distal to the initial sites of chemical digestion. Secretions from the accessory organs have already mixed with chyme before reaching this segment.
E. Jejunum: This middle section of the small intestine is characterized by a high density of plicae circulares for nutrient absorption. Although intensive chemical digestion continues here, the initial entry point for biliary and pancreatic fluids occurs more proximally. It follows the duodenum in the anatomical sequence of the tract.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is E
No explanation
Correct Answer is E
Explanation
A. Hormone at E - Growth Hormone (GH): The diagram indicates that hormone E is released from the anterior pituitary and targets the liver and skeletal muscles. In the liver, it stimulates the production of insulin-like growth factors (IGFs) to promote systemic growth. Its action on skeletal muscle facilitates protein synthesis and tissue hypertrophy.
B. Hormone A - Prolactin (PRL): The diagram depicts hormone A traveling from the adenohypophysis to the mammary glands. This protein hormone is essential for initiating and maintaining milk production following parturition. Its secretion is regulated by hypothalamic dopamine, which serves as a primary prolactin-inhibiting factor.
C. Hormone B - Thyroid-stimulating Hormone (TSH): The pathway labeled B shows a tropic hormone targeting the thyroid gland. TSH stimulates the follicular cells of the thyroid to synthesize and release thyroxine and triiodothyronine. This hormone is a critical regulator of systemic basal metabolic rate and cellular heat production.
D. Hormone C - Gonadotropins (FSH and LH): Label C represents the gonadotropins, specifically follicle-stimulating hormone and luteinizing hormone, which target the testes and ovaries. These hormones regulate gametogenesis and the secretion of sex steroids like testosterone and estrogen. They are essential for the maintenance of reproductive cycles and secondary sexual characteristics.
E. Hormone at D - Adrenocorticotropic Hormone (ACTH): The diagram shows hormone D being secreted from the anterior pituitary and traveling specifically to the adrenal gland. More specifically, it targets the adrenal cortex to regulate the production of steroid hormones. It is a critical component of the hypothalamic-pituitary-adrenal (HPA) axis.
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