Llamas, which are customarily known as mountain dwellers, have hemoglobin with higher O2 binding
affinity than that of humans. That being said, how would you predict the llama hemoglobin-O2
dissociation curve would differ compared to that of a human (see diagram below)?
©2014 Brooks/Cole, Cengage Learning
What will be an ideal response?
The slope of the llama hemoglobin-O2 dissociation curve would be steeper, effectively shifting the
curve to the left. Thus, the llama hemoglobin is shown to bind to O2 at lower partial pressures than that
of a human.
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Which of the following choices is not a function of astrocytes?
a. engulf dead or dying cells b. assist in immune defense c. stimulate formation of the blood-brain barrier d. take up neurotransmitters
Answer the following statements true (T) or false (F)
1.Each myofibril consists of two types of filaments, a thick actin filament and a thin myosin filament. 2.The relative thickness of vessel walls, from greatest to least, is: artery, vein, capillary. 3.The theoretical maximum heart rate for a 20-year-old is 200. 4.Cardiac output depends on heart rate and stroke volume. 5.The right ventricle sends blood to the lungs.
Mycoplasma tuberculosis, the causative agent in tuberculosis, primarily infects the alveolar macrophages and is therefore very fortunate in its size. Why is this statement true?
A) It is just large enough to land in the mucociliary ladder, where type II macrophages phagocytize them. B) It is too small to be caught in the mucociliary ladder and too large to be immediately exhaled, thereby landing it in the alveoli. C) It is just small enough to land in the bronchi, where it is absorbed by alveolar macrophages. D) It is just large enough to land in the respiratory bronchiole, where it migrates to the alveoli. E) It is just small enough to land in the mucociliary ladder, where it is moved to the alveoli to infect macrophages.
Which cluster of terms accurately reflects the nature of DNA replication in eukaryotes?
a. one origin of replication, bidirectional replication, conservative replication b. one origin of replication, unidirectional replication, conservative replication c. multiple origins of replication, bidirectional replication, semiconservative replication d. one origin of replication, bidirectional replication, semiconservative replication