Multiple Questions Answers

2. Which of these parts receive nerve impulses from the central nervous system, causing
muscle fibers to contract?
A. Interneurons
B. Motor neurons
C. Sensory neurons
D. Myelin sheaths

3. In the human immune system, the main function of the _______ is filtering blood.
A. thymus gland
B. spleen
C. tonsils
D. appendix

4. In flowering plants, which of these becomes the female gametophyte?
A. Microspore
B. Pollen grains
C. Pollen sacs
D. Megaspores