A. Osmosis has to occur through a semi-permeable membrane whereas diffusion can occur through any concentration gradient.
B is incorrect because net movement of osmosis is from area of low concentration to area of high concentration.
C is incorrect because both diffusion and osmosis is a form of passive transport
D is incorrect because the descriptions of osmosis and diffusion are swapped
Answer:
Sickle cell anaemia is a generic disorder which affects the red blood cells. The red blood cells assumes a sickle shape and contains lesser amount of the protein hemoglobin. Hemoglobin helps in the necessary transport of oxygen to other parts of the body.
The sickle cell allele is known to be advantageous to mainly people who stay in developing/underdeveloped counties who malaria endemic . People with the sickle cell allele have a higher chance of survival against malaria than people without this allele.
In modern countries malaria isn’t prevalent there due to the lack of vectors, poverty and environmental conditions which tends to support the survival of the mosquito. This means the sickle cell allele isn’t advantageous in this region.
Weasels are the predators while attic hates are the pray :)
Answer:
The correct answer will be option-B
Explanation:
Kidneys help maintain the blood volume by activating renin-angiotensin-aldosterone (RAAS) system. The activation of the system increase sodium retention which helps reduce the amount of water lost into the urine.
The RAAS system is activated when the receptors sense the decrease in the volume of the blood. This leads to the production of renin from the juxtaglomerular cells of the kideny. The renin help converts the inactive angiotensin to angiotensin I and angiotensin II by ACE enzyme.
Angiotensin II stimulates the production of aldosterone from the adrenal cortex which promotes the retention of sodium from tubules and maintains the long term blood pressure.
Thus, Option-B is the correct answer.
Activation of the renin-angiotensin-aldosterone (RAAS) system causes increased sodium retention by the kidneys, which leads to reduced water loss into the urine and therefore blood volume expansion. RAAS activation occurs during heart failure, which leads to fluid retention in the body. RAAS activation also occurs with renal artery stenosis, which is one cause of secondary hypertension.
