Levels of Organization
This is the smallest and most basic unit of life.
➡️ What is a cell?
This system sends fast signals using nerves.
➡️ What is the nervous system?
This is the main function of the endocrine system.
What is to produce and release hormones/regulate body processes?
This is the main function of the reproductive system.
What is to produce offspring/reproduction?
Touching a hot surface and pulling away quickly uses this system first.
What is the nervous system?
A group of similar cells working together to perform a specific job.
➡️ What is a tissue?
These are the three main parts of the nervous system.
➡️ What are the brain, spinal cord, and nerves?
These are the chemical messengers produced by the endocrine system.
What are hormones?
These are the male reproductive cells.
What are sperm?
Growth during puberty requires these two systems working together.
What are the endocrine and reproductive systems?
The stomach is made of different tissues working together for digestion.
This makes the stomach an example of this level of organization.
➡️ What is an organ?
This happens when you pull your hand away from something hot.
➡️ What is a response to a stimulus (reflex)?
This gland, often called the 'master gland,' controls many other endocrine glands.
What is the pituitary gland?
This organ in the female reproductive system is where a fetus develops.
What is the uterus?
One system sends fast signals, while another sends slower, long-lasting signals.
➡️ What are the nervous and endocrine systems?
If one organ in a system stops working properly, the entire system may not function as it should.
This best describes which level of organization?
➡️ What is an organ system?
This is the main reason the nervous system must work quickly.
➡️ What is to protect the body from danger?
This organ produces insulin to regulate blood sugar levels.
What is the pancreas?
This system works closely with the reproductive system using hormones.
What is the endocrine system?
Body systems must work together to maintain this condition.
➡️ What is homeostasis?
lue:
A disease damages cells in the pancreas. Soon after, hormone levels drop and multiple body functions are affected.
Which explanation BEST explains why this happens?
A. Cells only affect tissues, not organs
B. Organs work independently of other systems
C. Damage at a lower level of organization can affect higher levels
D. Organ systems are not connected to cells
C. Damage at a lower level of organization can affect higher levels
A student steps on a sharp object but reacts much slower than expected.
Which explanation BEST explains the delayed response?
A. Hormones take time to travel through the bloodstream
B. Damaged nerves slow the transmission of signals
C. The reproductive system controls pain
D. The brain does not receive information from nerves
B. Damaged nerves slow the transmission of signals
A student grows significantly taller than average because growth hormone levels remain high for a long time.
Which explanation BEST explains this effect?
A. Hormones act instantly and then stop
B. The nervous system controls long-term growth
C. Endocrine hormones cause slow, long-lasting changes
D. Growth only depends on organ size
C. Endocrine hormones cause slow, long-lasting changes
A student does not experience normal puberty after damage to hormone-producing glands.
Which explanation BEST explains why puberty is affected?
A. The reproductive system works independently
B. Puberty depends on hormones from the endocrine system
C. Puberty is controlled only by nerves
D. Hormones only affect growth, not development
B. Puberty depends on hormones from the endocrine system
A loud noise causes an immediate reaction, followed by a longer-lasting stress response.
Which explanation BEST describes what is happening?
A. Only the endocrine system is responding
B. Only the nervous system is responding
C. The nervous system responds first, then the endocrine system
D. The reproductive system controls stress responses
C. The nervous system responds first, then the endocrine system