Homework 1.3 Biology P

How do stomata function in most plants relative to gas exchange?

• Stomata close to prevent nitrogen from escaping.

• Stomata close to allow photosynthesis to occur

• Stomata open to allow CO₂ in and O₂ and water out.

• Stomata open to allow water to build up in the plant.

The circulatory and respiratory systems work together to provide cells with oxygen and nutrients and remove waste products such as carbon dioxide. When you need more oxygen, how does the circulatory system respond?

• More blood is sent to the lungs and less to the rest of the body.

• The blood vessels to the arms and legs constrict to conserve oxygen.

• The heart beats at a faster rate to match the rise in breathing rate.

• Blood moves more slowly through the organs to carry away more wastes.

What would happen on a hot day if your brain did not receive input that your body was starting to heat up?

• You would start to sweat.

• You would start to overheat.

• You would start to shiver.

• You would not feel any effect at all.

Flatworms are invertebrates with soft bodies, and some live in freshwater environments. Based on this information, what can you predict about how this organism's body handles osmoregulation? Select all correct answers.

• excretes dilute urine

• excretes concentrated urine

• absorbs as much salt as possible from surroundings

• excretes as much salt as possible from its body

When a newborn baby nurses, the mother's body is stimulated to produce milk. What would happen to the milk supply if the mother chose to bottle-feed rather than breastfeed?

• It would increase milk production in the mother

• It would decrease milk production in the mother

• It would stop milk production in the mother

People who experience severe blood loss go into a condition known as hemorrhagic shock. Shock occurs when the blood volume returning to the heart is reduced. The heart responds by trying to increase output, which can result in the patient bleeding to death if they are not treated in time. Is this an example of negative feedback or positive feedback?

• Positive Feedback

• Negative Feedback

• Neither

• Both

Many desert animals are nocturnal, waiting to forage when temperatures are cooler and humidity is greater. How does this behavior help these animals regulate water balance?

• The lower temperatures and higher humidity reduce the amount of water lost due to evaporation from respiration and sweat.

• The animals sweat less

• The animals sweat more

• The animals are able to change their fluid levels and water balance when they need.

What would happen to glucose homeostasis if the pancreas could no longer produce glucagon?

• The body would produce ketone bodies

• The body would no longer be able to release stored glucose in response to low blood sugar levels.

• The body would stop producing amino acids

• The body would release hormones