PHSI 208 Lecture 1: PHSI 208.6 SG Cardiovascular 1
Document Summary
Overview of the cardiovascular system; pressure, volume, flow, resistance, and velocity; the heart. The requirement for a circulatory system is a consequence of increasing size and complexity of multicellular organisms. It provides a concentration gradient from the blood to cells for nutrients and in the opposite direction for waste. Primary role: the distribution of dissolved gases and other molecules for nutrition, growth and repair, while simultaneously removing cellular wastes. Fast chemical signalling to cells by means of circulating hormones or neurotransmitters. Dissipation of heat by delivering heat from the core to the surface of the body. Mediation of inflammatory and host defense responses against invading microorganisms. Transport in the circulatory system can be divided into 3 types: materials entering the body, materials moved from cell to cell, materials leaving the body. The heart is a dual pump driving blood in two serial circuits: the pulmonary circuit and the systemic circuit. Carrying blood away from the heart are arteries.
