Homeostasis
The hypothalamus and core thermoreceptors notice if body temp is too low. The hypothalamus signals the smooth muscle in blood vessels to vasoconstrict and the skeletal muscle to shiver. This activity causes body temp to rise, which is again noticed by the hypothalamus and core thermoreceptors, so the hypothalamus turns off these heat gain mechanisms. In this scenario, which of the following statements is correct?
The scenario describes positive feedback in action.
The core thermoreceptors are the effector organs.
The hypothalamus is the control centre.
The skeletal muscle is the efferent pathway to the effector organ.
The hypothalamus is the control centre.
The hypothalamus interprets the sensory input and determines the response. Choice A is wrong as this is negative feedback. The effector organs are the skeletal muscles (which are not a “pathway”).
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C. process of diffusion
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Role in the maintenance of body temperature and removal of excess water and salts is performed by
A. lungs
B. kidney
C. skin
D. pancreas
The capillaries of the glomerulus arise from
A. efferent arteriole
B. afferent arteriole
C. renal artery
D. bowman’s capsule
The Al-Tasrif is the book based on surgical instruments written by
A. Abu al-Qasim al-Zahrawi
B. Ibn e Sina
C. Ibn ul Haithem
D. Abu Nasr al-Farabi
The reabsorption of salts during urine formation is allowed by
A. descending limp of loop of Henle
B. ascending limp of loop of Henle
C. Bowman’s capsule
D. glomerulus
In human kidneys, the single duct in which distal convoluted tubules opens is called
A. proximal duct
B. renal duct
C. papillary duct
D. collecting duct
The urine is carried to the urinary bladder from kidneys by the
A. gall bladder
B. urethras
C. ureters
D. sclerenchyma tissues
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