What type of cell specializes in killing virus-infected, cancer, or foreign graft cells directly?
A) cytotoxic T cells
B) regulatory T cells
C) antigen-presenting cells
D) helper T cells
A
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All of the following are characteristics of epithelial tissues, except
A. they all contain a basement membrane on their underside. B. they are well-supplied with blood vessels. C. their apical surface faces the outside or an internal body surface. D. the cells are densely packed, with little space between them. E. they can be composed of a single layer or multiple layers of cells.
Which statement compares sensory and motor neurons?
A. Sensory neurons carry afferent or incoming messages to the brain, while motor neurons carry efferent or outgoing messages away from the brain. B. Sensory neurons carry afferent or outgoing messages to the brain, while motor neurons carry efferent or incoming messages away from the brain. C. Motor neurons carry afferent or incoming messages to the brain, while sensory neurons carry efferent or outgoing messages away from the brain. D. Sensory neurons carry efferent or incoming messages to the brain, while motor neurons carry afferent or outgoing messages away from the brain.
Synovial fluid is an example of __________ fluid
Fill in the blank(s) with correct word
Which of the following is a feature that is unique to the left atrium?
A) bicuspid valve B) fossa ovalis C) tricuspid valve D) foramen ovale E) conus arteriosus