Cell Structures
What organelle controls cell activities?
What is the nucleus?
What is the smallest unit of life?
A cell.
Which system transports oxygen throughout the body?
The circulatory system.
Name one system that works with the muscular system.
The skeletal system.
What organ pumps blood?
The heart.
Why are mitochondria called the “powerhouse”?
They produce ATP energy through cellular respiration.
Arrange these in order: tissue, cell, organ, organism.
Cell → Tissue → Organ → Organism.
How do the respiratory and circulatory systems work together?
Respiratory brings oxygen in; circulatory delivers it to cells.
How do the digestive and circulatory systems interact?
Nutrients absorbed by digestion are transported by blood.
Which organ filters blood?
The kidney.
What happens if a cell loses its lysosomes?
Waste and damaged organelles accumulate, harming the cell.
How do tissues and organs work together in digestion?
Tissues form organs like the stomach, which breaks down food.
Why is the nervous system essential for movement?
It sends signals to muscles to contract.
What happens if the respiratory system malfunctions?
Other systems lack oxygen, causing failure.
Which organ produces bile?
The liver
How does the cell membrane help maintain homeostasis?
It regulates what enters and exits the cell.
Why is cell organization important for survival?
It allows specialization and efficiency in life processes.
What happens if the excretory system fails?
Toxins build up, harming organs and systems.
Why must body systems interact?
To maintain homeostasis and life processes.
Which organ controls breathing rate?
The brain (medulla oblongata).
What is the function of chloroplasts in plant cells?
They perform photosynthesis to make glucose for energy.
What is the correct sequence from cells to organisms?
Cells → Tissues → Organs → Organ Systems → Organism.
Which two systems work together to deliver oxygen to muscles during exercise?
The respiratory system (brings in oxygen) and the circulatory system (transports oxygen to muscles).
What changes occur in the body under stress?
Increased heart rate, breathing, and hormone release.
Which organ is part of both the digestive and endocrine systems?
The pancreas.