The Circulatory System
These blood vessels are the smallest in the body and connect arteries directly to veins.
Capillaries
A person's pulse is most commonly felt at these two body locations.
Neck and Wrist
In a bell-jar model of the respiratory system, the two (or one) balloon/s inside represent the ______.
lungs
These chemical messengers released in the body trigger the physical and emotional changes that lead to physical maturation during puberty.
Hormones
This outermost organ acts as the body's primary physical barrier to block harmful microorganisms from entering.
skin
These blood vessels carry blood away from the heart to the rest of the body.
Arteries
Engaging in vigorous physical activity like running causes the _____ rate to increase significantly.
pulse/ heart
In a bell-jar breathing model, the flexible rubber sheet stretched across the bottom represents ________.
diaphragm
These male reproductive organs are responsible for producing and storing sperm cells.
testes
These specialized blood cells actively attack and destroy invading pathogens that enter the bloodstream.
White blood cells (wbc)
The human circulatory system consists of these three primary components that work together to transport oxygen and nutrients.
heart, blood vessels, and blood
If a student’s resting pulse rate is 70 beats per minute and increases to 140 beats per minute after running, the numerical difference between the two pulse rates is __________.
70 beats per minute (beats/minute)
During inhalation, the diaphragm performs this action, flattening downward to draw air into the lungs.
contracting (or contraction)
In the female reproductive system, fertilization between an egg cell and a sperm cell takes place in the _____________.
the oviduct (or Fallopian tube)
Wearing long sleeves and applying insect repellent are effective ways to protect yourself from ___________.
insect bites (or mosquitoes)
This process is defined as the rhythmic contraction and relaxation of the heart muscles to pump blood.
heartbeat
Aside from exercise, give other emotional or physical conditions that can cause your pulse rate to rise.
stress; fear/excitement; fever (illness/sickness); caffeine intake
During exhalation, the diaphragm performs this movement, returning to its dome shape to push air out of the lungs.
relaxing (or relaxation)
This organ in the female reproductive system provides the site where a fertilized egg implants and develops into a baby.
Uterus (Womb)
Mosquito bites can transmit these two dangerous infectious diseases to human hosts.
malaria and dengue fever
Unlike fish which have a two-chambered heart, the human circulatory system relies on a heart with ____ chambers to keep oxygenated and deoxygenated blood separate.
Four (4)
During exercise, the heart pumps faster because working muscles require the blood to deliver more ___________.
oxygen
When you pull down on the rubber sheet of a breathing model, the balloons inside __________.
fill with air or inflate
Growth spurts, body hair growth, and skin changes/acne are physical changes that occur during puberty in _________________.
both boys and girls
Give some ways in preventing the spread of diseases?
Washing hands frequently, covering coughs and sneezes, and getting vaccinated