Which of the following structures is the 'leakiest'?

a. Continuous capillary

b. Sinusoidal capillary

c. Precapillary sphincter

d. Fenestrated capillary

Video transcript

Hi, everyone. Let's take a look at this question together. This type of capillary allows for the exchange of large molecules and even cells. Is it answer choice a sinusoidal answer. Choice B fenestrated answer choice C continuous or answer choice D all of the above. Let's work this problem out together to try to figure out which of the following types of capillaries allows for the exchange of large molecules and even cells. So in order to solve this question, we have to recall what we have learned about different types of capillaries and their permeability to determine which of the following allows for the exchange of larger molecules and even cells. And we can recall that in terms of permeability, when it comes to different types of capillaries, we know that the continuous capillaries are the least permeable type of capillary allowing only small. So lutes to pass across the capillary wall. And we know that type of capillary that is more permeable than the continuous capillaries are the fenestrated capillaries, which we know are more permeable than the continuous capillaries as they contain pores and are more permeable. However, more permeable than the fenestrated capillaries and the continuous capillaries are the sinusoidal capillaries, which are the most permeable type of cap and allow for the exchange of large molecules and even cells due to their many larger gaps in the capillary walls, which means that answer choice. A sinusoidal is the correct answer. And all other answer choices are incorrect since fenestrated capillaries and continuous capillaries do not allow for the exchange of large molecules. I hope you found this video to be helpful. Thank you and goodbye.