Knowledge Check Solutions
1) Volume of blood flow and the presence of special barriers - This is the correct answer.
Organs or tissues differ in the amount of a chemical that they receive or to which they are exposed. This is primarily due to two factors, the volume of blood flowing through a specific tissue and the presence of special "barriers" to slow down toxicant entrance. Organs that receive larger blood volumes can potentially accumulate more of a given toxicant.
2) Substances in the maternal blood must move through several layers of cells in order to gain entrance to placental blood - This is the correct answer.
The placental barrier protects the developing and sensitive fetus from most toxicants distributed in the maternal circulation. This barrier consists of several cell layers between the maternal and fetal circulatory vessels in the placenta. Lipids in the cell membranes limit the diffusion of water-soluble toxicants.
1) Volume of blood flow and the presence of special barriers - This is the correct answer.
Organs or tissues differ in the amount of a chemical that they receive or to which they are exposed. This is primarily due to two factors, the volume of blood flowing through a specific tissue and the presence of special "barriers" to slow down toxicant entrance. Organs that receive larger blood volumes can potentially accumulate more of a given toxicant.
2) Substances in the maternal blood must move through several layers of cells in order to gain entrance to placental blood - This is the correct answer.
The placental barrier protects the developing and sensitive fetus from most toxicants distributed in the maternal circulation. This barrier consists of several cell layers between the maternal and fetal circulatory vessels in the placenta. Lipids in the cell membranes limit the diffusion of water-soluble toxicants.