Similarities between an open circulatory system and a fountain, related to flow property of hemolymph and water. Concept introduction : Circulatory system is also called as cardiovascular system or vascular system. It is an organ system that allows the blood to circulate and transport nutrients like amino acid, oxygen, carbon dioxide, hormones, and blood cells to and fro from the cells in the body to provide nutrients and nourishment. Parts of circulatory system: Heart Circulatory fluid A set of interconnecting vessels In this system, the blood flows through open spaces called sinuses and lacunae. Vessels are connecting links between sinuses and body cells. Exchange of materials will take place between blood and sinuses.

Question

PCBs and River Otters: Otters in Washington State’s Green-Duwamish River have high levels of polychlorinated biphenyls (PCBs) in their livers. PCBs can bind to the estrogen receptors in animals and disrupt the endocrine system of these otters. The PCBs seem to increase the estrogen to androgen ratio, skewing the ratio toward too much estrogen. How would increased estrogen affect the river otter population? Based on your reading of the materials in this unit, what factors can affect fertility in humans? Explain how each of the factors affecting human fertility that you described can disrupt the human endocrine system to affect reproduction.

Answer 1

Question

Chapter 42.1, Problem 1CC

Summary Introduction

To explain: Similarities between an open circulatory system and a fountain, related to flow property of hemolymph and water.

Concept introduction:

Circulatory system is also called as cardiovascular system or vascular system. It is an organ system that allows the blood to circulate and transport nutrients like amino acid, oxygen, carbon dioxide, hormones, and blood cells to and fro from the cells in the body to provide nutrients and nourishment.

Parts of circulatory system:

Heart

Circulatory fluid

A set of interconnecting vessels

In this system, the blood flows through open spaces called sinuses and lacunae. Vessels are connecting links between sinuses and body cells. Exchange of materials will take place between blood and sinuses.

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