WK 2: Quiz 1 (Includes Animal Tissues & Circulation Pt. 1)

List the 4 types of animal tissue and name one function of each.

1. Epithelial → (lines the innermost layer of the digestive tract/arteries)

2. Connective → (fills internal spaces and provides support structure for bodies)

3. Muscle → (propels substances along the digestive tract)

4. Nervous → (directs and stimulates movement and secretions in the digestive tract)

What is homeostasis and how are fluctuations in a system returned to the set point?

• Homeostasis is an organisms tendency to maintain steady state or by having an internal balance regardless of change and the environments condition.

• Fluctuations is returned to the set point by the “negative feedback loop,” it reverses that pushed the system away from being balanced.

Why do flatworms lack a circulatory system while slugs have one?

• Flatworms lack a circulatory system causing them to be extremely thin

• Whereas slugs they are extremely thick, causing them to be more complex animals that require a circulatory system to pump oxygen and nutrients to the heart and blood vessel’s.

Describe the difference between open and closed circulation and give an example of an animal for each.

• Difference is open circulation uses less energy, closed circulation uses more energy

Example of an Animal:

• Open Circulation (arthropods, echinoderms, most molluscs)

• Closed Circulation (earthworms, squid, octopuses, cats, dogs, whales)