Air rushes into the lungs of humans during inhalation because
A. the volume of the thoracic cavity increases.
B. pressure in the alveoli increases.
C. the diaphragm contracts and pushes upward on the chest cavity.
D. smooth muscle lining the trachea, bronchi and bronchioles contracts and causes their volume to increase.
E. pulmonary muscles contract and pull on the outer surface of the lungs.
A. the volume of the thoracic cavity increases.
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All of the following events occur during T-dependent activation of a B cell EXCEPT
A. an antigenic fragment held within an MCH Class II molecule of a dendritic cell binds to a specific T cell receptor on a naïve T-helper cell. B. specific cytokines from the T helper cells stimulate maturation and complete activation of the antigen-stimulated B cell. C. antigen within MCH class II molecule is presented by B cell to an activated T helper cell. D. antigen binds to specific B cell receptor molecules. E. antigen bound to the B cell receptor is internalized and transferred to an MHC class II molecule which then moves to the plasma membrane. F. There are no exceptions. All of these events occur during T-depedent activation of B cells.
A seedling no longer needs its stored food sources once it develops
a. an embryo. b. cotyledons. c. leaves. d. roots.
Memory is ____
a. the storage and retrieval of sensory or motor experience b. the response to stimuli based on experiences c. the awareness of ourselves and surroundings d. voluntary e. involuntary
Baker’s yeast, which causes dough to rise, contains spores of a ____
a. sac fungus b. club fungus c. glomeromycete fungus d. mycorrhiza e. lichen