When Sarah thought that she heard a strange noise, the sympathetic nervous system of her triggered the 'fight-or-flight' response. This response is triggered in stressful situations. However, when the perceived threat was proved to be false, the parasympathetic nervous system starting slowing down her bodily functions to a normal condition. The parasympathetic nervous system triggers the 'relax-and-digest' response.
Hence, the answer is parasympathetic nervous system'.
Answer:
<h3>the right answer is option B</h3>
Physical exercise preserves bone mass. Measurements of bone biomarkers may reflect the events in bone during exercise. Fifteen healthy, well-trained individuals (7 men and 8 women) performed a running test for 21 min until exhaustion. Venous blood samples were drawn before and 30 min after the exercise to measure the levels of osteocalcin, the carboxyterminal propeptide of type I procollagen (PICP) and the carboxyterminal cross-linked telopeptide of type I collagen (ICTP). After exercise, the women had a marked increase in serum osteocalcin concentrations (from 7.5±5.0 μg/1 to 11.5±3.0 μg/1), whereas the level was unaffected in the men (from 14.5±3.0 μg/1 to 13.5±4.6 μg/l). In the men there was a marked increase in PICP (from 240±47 μg/1 to 268±56 μg/1) that was not seen in the women (from 244±70 μg/1 to 253±60 μg/1). In neither group did ICTP levels change. In conclusion, significant responses were seen in PICP and osteocalcin during exercise, indicating that such measurements may be valuable for the further delineation of the effects of physical activity on bone. Furthermore, the different responses in men and women point to interesting areas for future studies.
Improperly digested nutrients can indicate a problem in the inner most layer of the stomach known as the mucosa. This is the innermost layer of the stomach and it is responsible for housing the specialized exocrine cells that secrete gastric juice. Gastric juice is a mixture of hydrochlocic acid, mucus and digestive enzymes.