The walls of the alveoli are composed of two types of cells, type I and type II. The function of type II is to ________.
A) secrete surfactant
B) trap dust and other debris
C) replace mucus in the alveoli
D) protect the lungs from bacterial invasion
A) secrete surfactant
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Proteins that mediate or catalyze reactions in which the covalent bonding of the reactant molecules changes are called substrates.
Answer the following statement true (T) or false (F)
The primary goal of the immune response is
A. stimulation of mitotic activity in order to replace cells damaged by infection. B. maintenance of the proper ionic balance between lymph and blood. C. destruction or inactivation of pathogens and foreign material. D. removal of antibodies from lymph and lymphatic organs. E. reduction of the number of circulating memory lymphocytes.
The __________ glands are a source of sex pheromones.
A. ceruminous B. merocrine C. mammary D. sebaceous E. apocrine
All cross bridges within a sarcomere stroke in unison when pulling the actin filaments
Indicate whether the statement is true or false