Explain the pulmonary and systemic circuits of blood flow
What will be an ideal response?
In the systemic circuit oxygen-enriched blood that has entered the left atrium of the heart from the lungs is pumped out by the left ventricle into the aorta. From the aorta, the blood enters smaller and smaller arteries until it reaches the capillary beds of the organs. After gas and nutrient/waste exchange, the oxygen-depleted blood enters systemic veins and returns to the right atrium of the heart. Blood then moves into the pulmonary circuit. In that circuit, the oxygen-depleted blood is pumped out of the right ventricle to the pulmonary trunk, which delivers blood to the lungs. In the lungs, the blood is enriched in oxygen and returned to the left atrium via the pulmonary veins to enter the systemic system.
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Traits that are controlled by genes located on the X chromosome are said to be ________________.
A. autosomal B. gametal C. sex-linked D. pleiotropic
Which of the following is a reactant of the Calvin cycle?
a. carbon dioxide b. glucose c. oxygen d. water
Chromosomes become visible during prophase of
mitosis as a result of a. uncoiling. b. DNA synthesis. c. condensation. d. chromatid duplication. e. addition of proteins to the DNA
Na+ reabsorption is a(n) __________ process, while Cl- reabsorption is a(n) __________ process in the proximal tubule.
A Active; active B Active; passive C Passive; passive D Passive; active