Z3-2 - Professor: Daniel Young PDF

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Professor: Daniel Young...

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Animals maintaining a constant and elevated body temperature independent of ambient conditions are ectothermic. The flow of arterial blood downward alongside the ascending venous blood in the leg of the arctic wolf illustrates the concept of countercurrent exchange. In a cold environment, many species of birds and mammals maintain homeothermy by decreasing conductance and increasing heat production. allowing the extremities to operate at low temperatures. augmented muscle activity (e.g., muscular thermogenesis). All of the choices are correct Hummingbirds are able to reduce energy expenditure when inactive by becoming torpid while asleep. In multicellular animals, body fluids are divided into two main phases, intracellular and extracellular. Extracellular fluid is subdivided into blood plasma and interstitial fluid. Blood in vertebrates constitutes a tissue. Which of the following associations of blood components and functions is NOT correct? Globulins—carriers of simple sugars Which statement of red blood cell (RBC) structure or function is correct? In mammals and birds, RBCs continuously form from erythroblasts in the red bone marrow. A blood clot is formed by a fibrin meshwork in a reaction that is catalyzed by the enzyme thrombin. Platelets initiate clotting by releasing thromboplastin. initiate clotting by releasing thromboplastin. fibrinogen ____________ carry blood away from the heart. Arteries

The ____________ is involved with pumping blood to and from the lungs. pulmonary circuit The systemic circuit ultimately circulates blood from the left ventricle to right atrium. Oxygenated blood enters the heart at the left atrium. Contraction of the right ventricle forces blood initially into the pulmonary artery. In the tetrapod heart, the pacemaker is in the SA node In some invertebrates, if we cut the nerves leading to the heart and the heart stops beating, the heart is considered neurogenic. The blood vessel that provides oxygen to the heart tissue is the cornonary artery If a person has a blood pressure of 110/60, the "110" refers to the systolic pressure....