Collagen vascular diseases weaken the collagen in the tunica externa of blood vessels. Predict the effects of such a disease.

Video transcript

Hey, everyone. Let's take a look at this question together if the tunica exterra of blood vessels is damaged, which of the following functions is compromised. Is it answer choice. A the ability to accommodate changes in blood volume. Answer choice B the absorptive capacity of the blood vessels. Answer choice C the capacity to filter nutrients or answer choice. D the ability of the blood vessels to secrete hormones. Let's work this problem out together to try to figure out which of the following answer choices best explains the functions of the tunica exter that would be compromised if it is damaged. So, in order to solve this question, we have to recall what we have learned about the functions of the tunica exter and the role of the tunica exter to determine what would occur if the tunica exter of the blood vessel is damaged. And we know that the tunica exter or the adventitia is the outermost layer of blood vessels. And it is prima composed of connective tissue, including collagen fibers, which allows it to provide structural support and elasticity to the blood vessels. And the elasticity of the tunica exter allows it to accommodate varying volumes. So if the tunica exter of the blood vessels is damaged and it cannot properly provide structural support and elasticity to the blood vessels, the function would be compromised. Is answer choice. A the ability to accommodate changes in blood volume. Since the ability to accommodate changes in blood volume is related to the elasticity of the tunica exter of the blood vessels. A damaged tunica exter would not allow the blood vessel to accommodate changes in blood volume. So answer choice A is the only correct answer choice. I hope you found this video to be helpful. Thank you and goodbye.