Biology 30: Unit 1 Test

1. Which structure in the brain is responsible for regulating homeostasis, including temperature and hunger?

Cerebellum Hypothalamus Medulla Oblongata

2. Which hormone is primarily responsible for increasing blood glucose levels during the fight-or-flight response?

Insulin Cortisol Epinephrine

3. What part of the neuron receives signals from other neurons?

Axon Dendrites Soma

4. What is the primary function of the endocrine system?

To circulate blood and oxygen throughout the body To transmit electrical signals between neurons To regulate body processes through hormones

5. Which of the following is a function of the sympathetic nervous system?

Stimulates digestion Prepares the body for “rest and digest” activities Increases heart rate and prepares the body for “fight or flight”

6. The hormone insulin, which lowers blood sugar levels, is produced by which organ?

Liver Pancreas Thyroid gland

7. Which part of the brain is involved in motor control, balance, and coordination?

Cerebellum Thalamus Hippocampus

8. What is the role of the hypothalamus in the endocrine system?

It produces adrenaline in response to stress It secretes hormones that control other glands, such as the pituitary gland It regulates the secretion of insulin and glucagon

9. Which of the following best describes the function of the autonomic nervous system?

It controls voluntary movements of skeletal muscles It regulates the involuntary functions of the body, such as heart rate and digestion It connects the brain and spinal cord

10. Which of the following hormones is involved in the body's stress response and is produced by the adrenal glands?

Melatonin Cortisol Estrogen

11. What is the primary role of the myelin sheath on a neuron?

To protect the neuron from damage To speed up the transmission of nerve impulses To generate action potentials

12. Which part of the brain is primarily responsible for controlling breathing and heart rate?

Cerebellum Medulla Oblongata Corpus Callosum

13. The adrenal glands are located on top of which organ?

Kidneys Liver Pancreas

14. What is the function of the pituitary gland?

To regulate sleep patterns To control other endocrine glands by releasing hormones To produce insulin

15. Which part of the neuron transmits electrical signals away from the cell body?

Dendrites Axon Soma

16. Which hormone is responsible for the development of secondary sexual characteristics in females?

Testosterone Estrogen Progesterone

17. The blood-brain barrier is most effective in preventing the passage of:

Oxygen and glucose Bacteria and viruses Carbon dioxide

18. Which of the following is a function of the parasympathetic nervous system?

Accelerates heart rate Stimulates the release of adrenaline Promotes relaxation and digestion

19. What is the function of the thyroid gland?

To regulate metabolism through the release of thyroxine To control the body's stress response To control calcium levels in the blood

20. Which part of the nervous system controls voluntary actions?

Somatic Nervous System Autonomic Nervous System Central Nervous System

21. The blood-brain barrier primarily prevents the passage of:

Oxygen Hormones Toxins and pathogens

22. Which behavior would be classified as altruistic?

Helping others even at a personal cost Fighting for resources Competing for mates

23. The adrenal glands secrete which of the following hormones?

Insulin Thyroxine Adrenaline

24. The pituitary gland is often called the:

Master gland Brain's control center Heart's control center

25. Which of the following is NOT true about the central nervous system (CNS)?

It includes the brain and spinal cord It is responsible for voluntary and involuntary functions It controls only voluntary movements

26. The synaptic cleft is the gap between:

The axon and the soma Two neurons The soma and dendrites

27. The thalamus plays a key role in:

Coordination of movement Processing and relaying sensory information Control of emotions

28. Which hemisphere of the brain is primarily responsible for language processing in most individuals?

Right hemisphere Left hemisphere Both hemispheres

29. Which organ serves as the body's major thermoregulatory organ?

Skin Brain Heart

30. The cerebellum plays a critical role in motor control. Which of the following functions would be impaired if the cerebellum were damaged?

Regulation of emotional responses Fine motor coordination and balance Processing of sensory information from the skin

31. Which of the following structures is responsible for coordinating reflex arcs in the spinal cord?

Dorsal root ganglion Ventral horn of the spinal cord Interneurons

32. The endocrine system is involved in the regulation of long-term processes. Which of the following hormones directly influences the regulation of circadian rhythms?

Insulin Melatonin Glucagon

33. Which of the following is a major effect of the sympathetic nervous system during stress responses?

Increased digestive enzyme secretion Constriction of blood vessels in the skeletal muscles Dilation of bronchial tubes to increase airflow

34. The secretion of cortisol by the adrenal cortex is regulated by which of the following feedback mechanisms?

Positive feedback loop involving the hypothalamus Negative feedback loop involving the hypothalamic-pituitary-adrenal (HPA) axis Positive feedback loop involving the adrenal medulla

35. Which of the following best describes the role of the basal ganglia in motor control?

Coordination of voluntary movements and smooth motor activity Regulation of heart rate and respiration Integration of sensory input from the peripheral nervous system

36. Which of the following best describes the function of the anterior pituitary gland in the endocrine system?

It releases hormones that regulate the secretion of insulin from the pancreas It releases hormones that regulate growth, metabolism, and reproduction It produces and stores thyroid hormone

37. Which of the following neurotransmitters is primarily associated with the reward system and the feeling of pleasure?

Dopamine Serotonin Acetylcholine

38. Which of the following hormones is involved in the regulation of blood volume and pressure by promoting water retention by the kidneys?

Aldosterone Vasopressin (ADH) Parathyroid hormone

39. The all-or-nothing principle of action potentials means:

Action potentials will vary in size depending on the stimulus An action potential is generated only if the threshold level of depolarization is reached The neuron will either fire or not fire depending on the neurotransmitter present

40. In which of the following structures does the majority of neurotransmitter reuptake occur after a nerve impulse has been transmitted?

Axon terminal Dendrites Synaptic cleft