DE_LE_Unit5 (9/17/2025)

The cell theory of life is a fundamental concept in biology. Choose the correct word or phrases that explain how humans satisfy the cell theory.

Like all living things, the organs and tissues in the human body are made up of that form individual living units that can function independently from one another. Thus, they are the smallest in our body. All human children develop when unite to form a new organism.

that is reached at very high extracellular concentrations of solute. This is because solutes move through during active transport. Since there is a available in the cell membrane, they can only transport a at a given time.

Complete the sentences to describe the steps in sexual reproduction.

Sexual reproduction begins with meiosis, which results in male and female haploid . Sperm cells from the male organism fuse with the female egg cell in a process called . The resulting diploid cell, the , contains genetic information from both parents. This cell continues to divide via as it develops into an embryo and, later, a fetus.

1. A breastfeeding mother produces oxytocin and prolactin, which stimulate milk production.  The action of her baby nursing at the mother’s breast stimulates the production of more oxytocin and prolactin, which stimulate more milk production.

2. When blood glucose rises, the pancreas releases insulin; when blood glucose concentration falls, the pancreas stops releasing insulin.

3. The adrenal  gland produces adrenaline in response to a threatening situation. Adrenaline increases alertness and sends energy to muscles to prepare to fight or run away from danger. When the danger is averted, the adrenal gland stops producing adrenaline.

4. Wounded skin and blood cells send out chemical signals that increase the flow of blood, which causes swelling in the area. This sends out more signals that increase the flow of blood and blood products to the area, which increase the chemical signals.