Two properties of particles influence whether they can permeate the plasma membrane without assistance: ____
a. size and the relative solubility of the particle in lipid
b. size and the relative solubility of the particle in water
c. shape and the relative solubility of the particle in water
d. shape and size
e. electrical charge and shape
a
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Changes in the respiratory system that accompany aging include
A. overactive cilia, causing frequent coughing. B. thickening of the alveolar walls. C. thinning mucus. D. slowed swallowing reflex.
The plasma membranes of the digestive system's effector cells have receptor proteins that bind with and respond to GI hormones, neurotransmitters, and local chemical mediators
a. True b. False Indicate whether the statement is true or false
Which of the following cell types is incorrectly matched with its description?
A. Basophils - release histamine B. Eosinophils - attack worm parasites C. Lymphocytes - become macrophages D. Monocytes - largest of the WBCs E. Neutrophils - most numerous WBCs
What hormones increase blood sodium levels?
A) glucocorticoids B) epinephrine and norepinephrine C) mineralocorticoids D) gonadocorticoids