Why are there a large number of lymphatic vessels associated with the small intestine?
What will be an ideal response?
There is an abundant blood flow to and from the small intestine and the lymphoid system is important in reabsorbing the interstitial fluid that may escape from these vessels. Additionally, the Peyer's patches receive lymph originating from the digestive tract and lacteals absorb fats.
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The pH of chyme is usually 7.5-8.8
Indicate whether the statement is true or false.
The pontine storage center controls micturition by
A) stimulating bladder contractions. B) increasing contraction of the detrusor muscle. C) relaxing the internal urethral sphincter. D) increasing contraction of the external urethral sphincter and reducing detrusor muscle activity. E) stimulating the voiding reflex.
When blood passes through systemic capillaries, the oxygen saturation of hemoglobin changes
A. from about 98% to about 75% saturated. B. from about 40% to about 80% saturated. C. from about 70% saturated to about 99% saturated. D. from about 99% saturated to about 25% saturated.
The anterior nuclei of the thalamus
A) are part of the limbic system. B) secrete pituitary hormones. C) secrete melatonin. D) receive axon collaterals from the optic nerve. E) control feeding reflexes like licking and swallowing.