Question

3.9 human body organization exit ticket
name:
november 10, 2025
period:

1. write the structures listed below in order from least complex to most complex.

• organ
• cell
• organism
• tissue
• organ system

least complex:
most complex:

1. the diagram below represents levels of organization in living things.

which term would best represent x?
(1) human (2) stomach
(3) tissue (4) organelle

1. below are pictured various parts of the human body. using the numbers 1 - 5, label each part from least complex to most complex.

circulatory system blood cell heart baby muscle tissue

# # # #

Explanation:

1. In biological organization, cells are the basic unit. Tissues are groups of similar cells. Organs are made of different tissues. Organ systems are groups of organs. An organism is made of organ systems. So the order is cell (least complex) → tissue → organ → organ system → organism (most complex).
2. In the level - of - organization diagram (cell → X → organ → organ system → organism), tissues are made of cells and organs are made of tissues. So X is tissue.
3. Blood cell (cell level - least complex, label 1). Muscle tissue (tissue level - label 2). Heart (organ level - label 3). Circulatory system (organ - system level - label 4). Baby (organism level - most complex, label 5).

Answer:

1. cell, tissue, organ, organ system, organism
2. (3) tissue
3. Circulatory System: 4; Blood Cell: 1; Heart: 3; Baby: 5; Muscle Tissue: 2