Glossary 611
vas deferens. Long, narrow tube through
which sperm travel into the man’s body
to the ejaculatory duct. (7)
visitation rights. A divorced parent’s right
to visit his or her children during certain
specifi ed times and under certain
conditions. (18)
voluntary motor movements. Motions
learned and done at will. (12)
W
weaning. Phasing out the taking of milk
from breast or bottle. (13)
“we” messages. Similar to “I” messages, but
imply that two or more people are jointly
involved and affected by a problem
situation. (5)
window of opportunity. A sensitive period
in which a person’s capacity to develop a
certain skill peaks. (13)
“win/win” method. Problem-solving
approach in which parent and child
work together to solve a problem. (5)
work-based learning programs. School
programs that help students get
fi rsthand experiences in the world of
work. (22)
Y
“you” messages. Messages that place all the
blame for a problem on others, creating
defensiveness and resistance. (5)
Z
zygote. The new cell that forms when the
nuclei of the sperm and egg merge into
one nucleus. (7)