Which structure conducts urine from the kidney to the urinary bladder?

The urethra is a tube that connects the bladder to the external environment and serves as a passageway for urine to exit the body during urination. In males, the urethra also serves as a passageway for semen to exit the body during ejaculation, making it a part of both the male reproductive system and the urinary system.

The other options listed are:

a. Ureter - a tube that connects the kidney to the bladder and is a part of the urinary system

c. Testes - the male reproductive organs that produce sperm and are a part of the male reproductive system

d. Epididymis - a tube that connects the testes to the vas deferens and is a part of the male reproductive system.

When the sympathetic nervous system is stimulated, it activates the "fight or flight" response, which prepares the body for physical activity or stressful situations. This response includes several physiological changes, such as:

Increased heart rate and cardiac output: The sympathetic nervous system releases adrenaline and noradrenaline, which increase heart rate and cardiac output to provide more oxygen and nutrients to the muscles.

Decreased uterine activity: The sympathetic nervous system inhibits uterine contractions to prevent

premature labor.

Decreased pancreatic activity: The sympathetic nervous system inhibits insulin secretion and promotes glucagon secretion to increase blood glucose levels.

Decreased gastrointestinal activity: The sympathetic nervous system inhibits digestive functions to divert blood flow to the muscles.

Cells of similar structure and function are grouped together to form a tissue. Tissues can be found in many different types of organisms, including animals and plants. There are four main types of tissues in animals: epithelial tissue, connective tissue, muscle tissue, and nervous tissue. Each type of tissue has a specific function and is composed of specialized cells that work together to perform that function.

An organ is a structure made up of two or more tissues that work together to perform a specific function. A system is a group of organs that work together to perform a specific function. A membrane is a thin layer of tissue that covers a surface or divides a space or organ.

DNA is a double-stranded macromolecule made up of nucleotides that carry genetic information. The sequence of nucleotides in DNA determines the genetic code, which controls the development and function of living organisms. Chromosomes are structures made up of DNA and proteins that carry genes. Nucleotides are the building blocks of DNA and RNA. RNA, on the other hand, is a single-stranded macromolecule that plays a key role in protein synthesis by carrying genetic information from DNA to ribosomes.