Which thin-walled blood vessels lack muscular walls?

Veins
Arterioles
Capillaries
Arteries

Which blood vessel does not carry oxygen rich blood?

Pulmonary vein
Pulmonary artery
Capillaries
Arteriole

How do arteries differ in structure from capillaries and veins?

Arteries have more elastin in tissue than veins and capillaries.
Arteries appear flatter in a cross section than veins and capillaries.
Arteries have valves which are absent in veins and capillaries.
Arteries have walls that are thinner than veins and capillaries.

Describe the potential effects, on people, of unprotected exposure to the sun.give an example of 1 new thing have you learned about the sun’s uv rays.

The load is the pivot point of a lever.

You isolate an infectious substance capable of causing disease in plants, but you do not know whether the infectious agent is a bacterium, virus, viroid, or prion. you have four methods at your disposal to analyze the substance and determine the nature of the infectious agent.i. treat the substance with enzymes that destroy all nucleic acids and then determine whether the substance is still infectious.ii. microscope.iii. culture the substance on nutritive medium, away from any plant cells.iv. treat the sample with proteases that digest all proteins and then determining whether the substance is still infectious.if you already know that the infectious agent was either bacterial or viral, which method(s) listed above would allow you to distinguish between these two possibilities? a) ib) iic) ii or iiid) iv