Homeostasis and Hormonal Regulation in IB Biology

The video covers the IB biology curriculum focusing on the endocrine and reproductive systems. It explains how hormones regulate various body functions, including blood sugar levels, body temperature, appetite, sleep cycles, and sex determination. The video also discusses diabetes, the role of melatonin in circadian rhythms, and the process of in vitro fertilization.

What is the primary function of the endocrine system?

• To filter waste from the blood

• To digest food

• To produce red blood cells

• To secrete chemical substances called hormones

What hormone is secreted when blood sugar levels are too high?

• Insulin

• Thyroxine

• Glucagon

• Leptin

What is the cause of type 1 diabetes?

• Overproduction of insulin

• Genetic error leading to no insulin production

• Lack of physical activity

• Excessive sugar intake

Which gland is responsible for regulating sleep cycles?

• Pituitary gland

• Pineal gland

• Thyroid gland

• Adrenal gland

Which hormone is responsible for increasing metabolism and producing heat?

• Melatonin

• Thyroxine

• Insulin

• Leptin

What happens to leptin levels when there is an increase in adipose tissue?

• Leptin levels decrease

• Leptin levels increase

• Leptin is not affected by adipose tissue

• Leptin levels remain the same

What gene on the Y chromosome is responsible for male sex determination?

• XRY gene

• SRY gene

• TDF gene

• MDF gene

Who debunked the soil and seed theory of sexual reproduction?

• Gregor Mendel

• William Harvey

• Aristotle

• Charles Darwin

What is the first step in the in vitro fertilization process?

• Mixing eggs with sperm

• Halting estrogen and progesterone

• Super ovulation

• Injection of HCG hormone

What does the term 'in vitro' mean in the context of fertilization?

• In the ovary

• In the body

• In a test tube

• In the uterus