Fig. 3.1 is a photomicrograph showing a section through two different kinds of blood vessel, X and Y.
Name the two kinds of blood vessel labelled X and Y in Fig. 3.1. X ____________________ Y ____________________
State the reasons for your identification of the type of blood vessel shown by Y in Fig. 3.1.
Tissue fluid and lymph are produced as blood reaches the capillary networks within body tissues.
Explain why tissue fluid has a closer resemblance to blood plasma than to blood.
Explain why the tissue fluid formed after blood arrives in the capillary network has a higher concentration of amino acids than the newly formed lymph draining away from the network.
The trachea, bronchi and bronchioles in the gas exchange system need glucose and oxygen from the blood for the smooth muscle to function. Outline the function of smooth muscle in the gas exchange system.
State the reasons for your identification of the type of blood vessel shown by Y in Fig. 3.1.