All of the following are correct about human circulation EXCEPT (A) blood in capillaries travels

All of the following are correct about human circulation...

Key Concepts

Capillary Blood Flow

Capillary blood flow refers to the slow movement of blood through the smallest blood vessels, which allows for the efficient diffusion of nutrients, oxygen, and waste products between the blood and surrounding tissues.

Blood Pressure

Blood pressure is a measure of the force exerted by circulating blood on the walls of blood vessels. It is influenced by various factors such as cardiac output, blood volume, and vessel resistance, and while individual variation exists, broad generalizations about differences between populations require careful statistical support.

Heart Rate

Heart rate, the number of beats per minute, is a fundamental measure of cardiac activity. It is regulated by the autonomic nervous system and reflects the balance between the body's oxygen demands and cardiac output under normal conditions.

Heart Rate Response to Activity

The heart rate response to physical activity is an important aspect of cardiovascular regulation, where the rate increases in response to exercise or stress to meet the heightened metabolic demands of the body.

Arterial and Venous Structures

Arteries and veins display distinct structural features; arteries have thicker, more muscular walls to withstand and maintain high pressure as they carry blood away from the heart, while veins have thinner walls and contain valves to help return blood to the heart under lower pressure.

Transcript

00:01 Hi, everyone.

00:01 So the first thing i really want to know it before we get into the rest of the question is the word accept.

00:06 It might seem obvious, but i really want to underscore that we're looking for the answer that is incorrect, i .e.

00:12 Not true about human circulation.

00:14 Just make sure you pay attention to the extra little words like but except, so on.

00:19 So let's go through the answer choices and figure out which ones are true and why.

00:22 So first off, a, blood and capillaries travel slowly to allow for diffusion of nutrients and waste.

00:29 So whenever i get, get to these questions, i like to just think about the basic function of the system.

00:34 So what does the circulatory system do? the system has a few main jobs.

00:39 So it likes to transport nutrients, things like oxygen and hormones to sell.

00:46 It also removes things like metabolic waste, carbon dioxide, nitrogenous waste, things like that.

00:53 So let's envision our little capillary.

00:57 I'm going to draw it here for you.

00:58 And then we have our little blood cells.

01:00 Usually you have a network of capillaries.

01:03 So as blood news through your capillary, it's trying to bring in and bring out these different things.

01:09 So it's trying to diffuse.

01:10 So would it make more sense for something to go really slowly through that area really quickly? it would make a lot more sense to go really slowly, right? because it gives it physically more time to diffuse, gives it more time to do its job.

01:23 So the answer choice is true.

01:25 Since that answer choice is true, that means it's not our correct answer.

01:28 So let's move on to answer choice b.

01:31 Normal blood pressure is higher in males than in females.

01:34 So let's think of the anatomy of males and females.

01:37 Is there anything physically different in their circulatory systems? no, there's nothing inherently different about the anatomy and the circulatory systems that would affect blood pressure levels.

01:48 That means the answer choice is false.

01:50 Since the answer choice is false, that means our correct answer.

01:53 But let's finish going through the rest of these questions.

01:55 Just make sure to understand why the others are true.

02:00 So next we have answer choice c.

02:01 The average heart rate in pulse is about 70 beats per minute.

02:05 So unfortunately, this answer choice is kind of what i like to call a bio -trivia question.

02:11 It's still important to know, but it's hard to reason through it if you don't have any extra background information...