Biological Hierarchy & Regulation
The correct order of biological organization from simplest to most complex.
What are Cells, Tissues, Organs, Organ Systems, and Organisms?
This cell has a biconcave disc shape with no nucleus to maximize space for oxygen transport.
What is a Red Blood Cell (Erythrocyte)?
Lacking this organelle maximizes interior volume in red blood cells for hemoglobin to transport oxygen.
What is the Nucleus?
These bone cells build hard bone matrix by secreting protein matrices called osteoid.
What are Osteoblasts?
The primary oxygen-binding protein packed inside red blood cells.
What is Hemoglobin?
These unspecialized "blank slate" cells can divide continuously and differentiate into specialized cell types.
What are Stem Cells?
Characterized by long axons and dendrites packed with mitochondria for fast signaling.
What is a Neuron (Nerve Cell)?
The process in which flexible white blood cells squeeze out of blood vessels into surrounding tissue.
What is Diapedesis?
Large cells specialized in reabsorbing and breaking down old bone tissue.
What are Osteoclasts?
The molecule produced by mitochondria that provides energy for cellular signaling and muscle movement.
What is ATP (Adenosine Triphosphate)?
The process of programmed cell self-destruction that prevents uncontrolled cell division.
What is Apoptosis?
This cell stores energy in a huge central lipid vacuole that pushes its organelles to the outer edges.
What is an Adipocyte (Fat Cell)?
Neurons and myocytes require an abundance of this organelle to produce ATP for continuous signaling and contraction.
What is the Mitochondria?
Star-branched cells that sit within bone tissue to sense mechanical stress and regulate calcium balance.
What are Osteocytes?
The structural protein that fills flat epithelial cells to make them tough and waterproof.
What is Keratin?
Uncontrolled growth that occurs when cells lose division control due to genetic mutations.
What is Cancer?
Thread-like cells containing aligned protein tracks, or striations, to generate contractile force.
What is a Myocyte (Muscle Cell)?
The mechanism used by white blood cells to change shape and engulf invading pathogens.
What is Phagocytosis?
The unmineralized organic protein matrix secreted by osteoblasts before it hardens.
What is Osteoid?
This structural characteristic allows both red and white blood cells to squeeze through narrow capillaries.
What is a Flexible Cell/Outer Membrane?
This level of organization consists of a group of similar cells working together to perform a dedicated function.
What is a Tissue?
Tightly locked, flat cells filled with keratin that form a waterproof barrier seal.
What is an Epithelial Cell?
The aligned motor proteins track inside myocytes, which allows them to convert chemical energy into mechanical force.
What are Striations?
The ongoing balance between osteoblasts building bone and osteoclasts breaking it down is necessary for this continuous biological cycle.
What is Bone Remodeling (or Resorption and Repair)?
The large central lipid vacuole inside an adipocyte displaces these components to the outer edges of the cell.
What are the Nucleus and Organelles?