The circulator system
This organ pumps approximately 2,000 gallons of blood daily through the human body.
What is the Heart
The prenatal stage of development when the zygote implants into the uterine wall.
What is the embryonic stage?
This part of the brain controls basic functions like breathing and heart rate.
What is the brainstem?
This "master gland" controls many other glands and is located in the brain.
What is the pituitary gland?
These vessels carry oxygen-rich blood away from the heart.
What are arteries?
This stage of development, from birth to age 2, is marked by rapid physical growth and sensory exploration.
What is infancy?
These cells, known as the building blocks of the nervous system, transmit electrical signals.
What are neurons?
This gland in the neck regulates metabolism through hormone production.
What is the thyroid gland?
Known as the "pacemaker" of the heart, this node regulates your heartbeat.
What is the sinoatrial (SA) node?
Puberty is initiated by the release of these hormones in males and females, respectively.
What are testosterone and estrogen?
This division of the autonomic nervous system is responsible for the "fight or flight" response.
What is the sympathetic nervous system?
This hormone, produced by the pancreas, lowers blood sugar levels.
What is insulin?
This iron-containing protein in red blood cells binds oxygen for transport
What is hemoglobin?
In Erik Erikson's stages of psychosocial development, this crisis is faced during adolescence.
What is identity vs. role confusion?
The gap between two neurons, where neurotransmitters are released.
What is the synapse?
The adrenal glands produce this hormone, commonly known as the "stress hormone."
What is cortisol?
The exchange of gases occurs in these tiny structures in the lungs.
What are alveoli?
This milestone, occurring around 8 months of age, reflects a baby's ability to form secure attachments.
What is stranger anxiety?
This brain region is involved in coordinating voluntary movement and balance.
What is the cerebellum?
This hormone, responsible for regulating sleep cycles, is produced by the pineal gland.
What is melatonin?