Homeostasis
Which of the following is an example of negative feedback?
The uterine contractions during childbirth push the baby’s head against the cervix which stimulates the uterus to contract.
The release by platelets that aggregate at the site of a blood vessel injury, of compounds that promote platelet aggregation.
As resting membrane potential rises, voltage-gated ion channels open which allow ions to enter the axon which causes further rise in the membrane potential and more ion channels to open.
As blood sugar level rises, insulin is released which promotes the absorp-tion of glucose from the blood by liver, muscle and fat cells.
As blood sugar level rises, insulin is released which promotes the absorp-tion of glucose from the blood by liver, muscle and fat cells.
In this choice the response to rising glucose is the release of insulin, which promotes a decrease in blood glucose by causing it to be absorbed from the blood. That is, the response is to oppose the change that initiated the response. This is termed “negative” feedback. The other three choices are examples of positive feedback.
As blood sugar level rises, insulin is released which promotes the absorp-tion of glucose from the blood by liver, muscle and fat cells. In this choice the response to rising glucose is the release of insulin, which promotes a decrease in blood glucose by causing it to be absorbed from the blood. That is, the response is to oppose the change that initiated the response. This is termed “negative” feedback. The other three choices are examples of positive feedback.
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If the change in temperature occurs then this change may affectA. metabolism process
B. functions of enzymes
C. process of diffusion
D. process of osmosis
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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