13. The different functions of the skeletal system include all of the following EXCEPT: *
a) Forms blood cells
b) Protects internal organs
c) Stores hormones
d) Assists movement

14. Which type(s) of muscle can contract without stimulation from the nervous system? *
a) skeletal only
b) skeletal and smooth
c) smooth and cardiac
d) cardiac only

15. Which division of the nervous system speeds up your heart rate? *
a) somatic
b) autonomic
c) central
d) brain and spinal cord

16. True or false. The pregnancy timeline begins on the first day of a women's menstrual cycle. *
a) True
b) False

17. Which of the following are events following fertilization? (Check all that apply. There may be more than one answer). *
a) Embryo develops into the fetus
b) Zygote cell rapidly divides
c) Embryo embeds into uterine wall
d) Zygote travels down the fallopian tube toward the uterus

18. Human development occurs in a series of stages, or processes. Which of the following best describes the key events that occur during gastrulation? *
a) The blastocyst attaches to the wall of the uterus and cells begin differentiating.
b) Cells migrate from the ectoderm to form the mesoderm; resulting resulting in the formation of three cell layers.
c) A sperm and egg fuse producing a fertilized egg.
d) Mesodermal tissue differentiates into the notochord and the nervous system develops.

19. How do endocrine glands send messages to other organs? (Select the best answer.) *
a) They release impulses that travel in the blood
b) They release hormones that travel in the blood
c) They release insulin that travels in the blood
d) They release action potentials that travel in the blood

20. All of the following are true about the integumentary system EXCEPT: *
a) It forms vitamin E
b) It is a barrier against infection and injury
c) It removes wastes
d) It gathers information and regulates body temperature

21. The brain forms in which stage / trimester? *
a) Blastula stage
b) Trimester 1
c) Trimester 2
d) Trimester 3