Questions

Question 1

what is an organ

Answer 1

a group of different tissues that work together to perform a certain function

Question 2

what is a tissue

Answer 2

a group of similar cells that work together to carry out a particular function

Question 3

describe the differences between arteries and veins

Answer 3

-arteries have thick walls to withstand high pressure but veins have thin walls because the blood pressure is low
-arteries have a narrow lumen to maintain high blood pressure but veins have a wide lumen to reduce resistance between the blood and walls of the vein
-arteries carry blood away from the heart
-veins carry blood towards the heart

Question 4

smallest to largest for artery capillary and vein in thickness

Answer 4

capillaries only one cell thick- reduce diffusion distance
vein have thin walls- blood pressures low
arteries have thick walls- withstand high pressure