WorksheetsHomeostasis
Total questions: 6
Worksheet time: 14mins
The human body comprises many levels of organization, including organ systems. Human body temperature is regulated by a combination of three organ systems that work together to maintain homeostasis. They are the nervous system, the muscular system, and the circulatory system. These three systems are shown in the image Temperature regulation is controlled by a feedback loop. A positive feedback loop works to intensify the effect of a change, while a negative feedback loop works to decrease the effect of a change.
Humans sweat to reduce their body temperature and maintain homeostasis. Which BEST describes the feedback mechanism involved in sweating?
It is a negative feedback loop because it is an attempt to reverse a change in the body's condition.
It is a negative feedback loop because the body is pulling in heat from the skin.
It is a positive feedback loop because the body is adding heat to the skin.
It is a positive feedback loop because it is an attempt to intensify a change in the body's condition
Type 2 Diabetes
Type 2 diabetes is a chronic condition that affects the way an organism processes blood sugar, or glucose. Humans that have Type 2 diabetes develop a resistance to insulin. Insulin is a hormone that is essential for blood sugar regulation because it controls the movement of glucose into cells within the body. The pancreas is an organ in the human body that releases insulin into the bloodstream. In humans with Type 2 diabetes, the pancreas is unable to create enough insulin to maintain stabilized blood sugar levels. The model shows some of the ways Type 2 diabetes affects the human body
The diagram shows the feedback mechanisms that maintain healthy blood sugar levels in a human without Type 2 diabetes. These feedback mechanisms are disrupted with Type 2 diabetes.
Use both diagrams to answer the question.
Which BEST describes how Type 2 Diabetes affects feedback mechanisms in the body?
The feedback mechanisms no longer function to increase blood sugar levels.
The feedback mechanisms no longer function to lower blood sugar levels
The feedback mechanisms work slower to increase blood sugar levels
The feedback mechanisms work faster to lower blood sugar levels
Investigating Plant Stomata
Austin and Marissa went to visit their grandparents' farm in Minnesota over the summer. Their grandmother noted the corn yield this year would be down from previous years due to a drought they were experiencing. However, she noted her native prairie wildflower garden still looked beautiful and was blooming well.
Austin and Marissa had just finished taking a plant biology course where they studied corn stomata, which are openings in plant leaves that open and close in response to humidity and for gas exchange. While this allows the plant to “breathe” by exchanging gases, it can also lead to moisture loss.
Marissa and Austin decided to study coneflowers, one of the wildflowers in their grandmother's garden. They wanted to know how coneflowers regulate their stomata in response to moisture. They created a graph to represent the data they collected about precipitation:
They also noted the average percentage of stomata open during each month in their notebook:
Austin and Marissa selected two coneflower plants and put them in separate containers. They gave one very little water (simulating drought conditions) and gave the other regular water each day. They noted the plant that received less water had fewer open stomata and seemed to be growing slower over the summer.
What could be happening in each plant? Select all that apply.
The plant receiving water is growing faster because its stomata are open, and it is losing more moisture through the stomata. The water it loses will help it grow, and the plant does not need to close stomata to retain its osmotic balance
The plant under drought conditions is losing less moisture through open stomata because it has been receiving less moisture overall. Having open stomata would not affect the moisture loss, and the plant would remain in a neutral osmotic state.
The plant under drought conditions is closing its stomata to prevent moisture loss and to help conserve water. It is growing more slowly because it is conserving water to retain its osmotic state and nutrients in order to stay alive.
The plant that is receiving water has more open stomata because it does not need to conserve water as much as the plant not receiving water. It can lose more moisture from the open stomata; it does not have to close stomata to conserve moisture.
The plant that is receiving less water is growing more slowly because it doesn't have enough water to carry out life processes. The open stomata are a result of exposure to light, not how much water the plant receives
Using information from Marissa and Austin's research, complete the statement about the relationship between precipitation and open stomata.
Drag and drop the correct answers to the boxes to make the statement true
The percent of open stomata (a) when plant is under drought conditions. This is because the plant needs to (b) water loss.
When would a buffer system become activated in a human?
when too much salt has been ingested, causing the blood to become hypertonic
when too many carbohydrates have been ingested, raising blood glucose levels
after exercise, when the bloodstream pH is acidic, because excess CO2 is present
after exercise, when the body temperature has increased
A scientist is viewing samples of red blood cells taken from three different solutions. The diagram below shows the three samples of cells.
Which sample most likely contains red blood cells that were placed in a solution with a high salt concentration?
First One
Second one
Third One
None of them
Read the passage and answer the following question(s).
Investigating Feedback Mechanisms of Homeostasis
Part of the brain, called the hypothalamus, is responsible for maintaining stable conditions in the body by sending responses out to the parts of the body affected by change. When a stimulus causes an imbalance in the body, the information is received by the control center in the hypothalamus. As a result, output information is sent to various parts of the body to assist in returning to the stable set-point at which the body best functions. This maintenance of stable conditions within the body is called homeostasis.
Figure 1
Jane and Theo are learning about the mechanisms of homeostasis in their biology class. They decide to investigate how their bodies will respond to various stimuli. They complete the following tests:
Sit on a bench in the sunshine on a day that is over 80°F.
Run quickly around the gymnasium.
Stand in a room that is cooled to 40°F.
They decide to use a thermometer to measure the temperatures of their foreheads to determine how their bodies respond to change. They continue each test for 10 minutes. The results of their tests are as follows:
The Sun transfers heat to Jane and Theo’s bodies as they sit on the sunny bench, increasing their body temperature. Which of the following responses by their bodies would help decrease their temperature and maintain homeostasis? Choose all that apply.
Sweating; the water released from their skin will evaporate
Vasodilation; their skin will turn red as blood is moved to the surface of the skin.
Shivering; their muscles will begin moving quickly.
Vasoconstriction; their extremities will turn pale or blue as blood moves to the core of the body.
Goosebumps; the muscles under the hair in their skin will contract
Using information from Figure 2, complete the statement below about how Jane’s and Theo’s bodies reacted when they stood in the cold room. Drag and drop the correct answers into the boxes to make the statement true. The initial stimulus jane and Theo experienced in the first five minutes of the cold room was a(n) (a) in body temperature. This was a result of the body moving (b) homeostasis. Their bodies responded by (c) their body temperature.
