IB SEHS Homeostasis

What is homeostasis?

• The process of breaking down food for energy

• A self-regulating biological process that maintains a stable internal environment

• The movement of muscles during exercise

• The absorption of nutrients in the intestines

Which mechanism is primarily responsible for maintaining homeostasis in the body?

• Positive feedback

• Negative feedback

• Passive transport

• Osmosis

How is blood pH regulated in the body?

• By the concentration of oxygen and monitored by the digestive system

• By the concentration of carbon dioxide and monitored by the respiratory control centre and chemoreceptors

• By the amount of glucose and monitored by the pancreas

• By the level of hormones and monitored by the endocrine system

Which systems are involved in the process of thermoregulation to maintain a core body temperature of 37 ± 1°C?

• Digestive and reproductive systems

• Cardiovascular, muscular, nervous, and integumentary systems

• Skeletal and urinary systems

• Endocrine and lymphatic systems

Which of the following is NOT a physiological response involved in thermoregulation?

• Sweating

• Vasodilation

• Shivering

• Digestion

Which factors influence thermoregulatory responses?

• Only environmental conditions

• Only training status

• Training status, body composition, environmental conditions, sex differences, and hormonal influences

• Only hormonal influences

How are blood glucose levels regulated in the body?

• Through the actions of insulin and glucagon

• By the kidneys filtering blood

• By the liver producing bile

• Through the absorption of water in the colon

Describe how exercise influences insulin release and glucose uptake during physical activity.

• Exercise decreases insulin release and reduces glucose uptake

• Exercise increases insulin release and enhances glucose uptake

• Exercise has no effect on insulin or glucose uptake

• Exercise only affects glucose uptake, not insulin release

Which of the following best describes the difference between intrinsic and extrinsic mechanisms in the regulation of heart rate?

• Intrinsic mechanisms are controlled by external factors, while extrinsic mechanisms are internal

• Intrinsic mechanisms originate within the heart, while extrinsic mechanisms involve external factors such as the nervous system

• Both mechanisms are unrelated to heart rate regulation

• Intrinsic mechanisms involve hormones only, while extrinsic mechanisms involve muscles only

Which of the following best describes the difference between acute and chronic physiological responses to environmental factors?

• Acute responses are long-term, while chronic responses are short-term.

• Acute responses are short-term, while chronic responses are long-term.

• Acute responses only occur in cold environments, while chronic responses occur in hot environments.

• Acute responses are psychological, while chronic responses are physiological.