1. During exercise, blood flow to skeletal muscles must increase to meet the increase in oxygen demand for ATP (energy) production. The initial response that increases blood flow to the muscle cells is automatic and independent of the nervous and endocrine systems.

1. Which type of homeostatic regulation is this? Explain.

Identify the phrases that correctly apply to how affinity determines receptor-ligand interactions. Select all that apply.

* allows receptors to recognize only a signal that they are made for

* allows receptors to form non-covalent bonds with messenger molecules

*relies on molecular fit between two molecules

* allows receptors to distinguish between very similar molecules

* in simple words it is just a strength of ligand binding

* is a measure of strength of binding

determines which type of ligands will bind to a receptor

Cystic fibrosis is genetic disease caused by mutations in the CFTR gene. The consequence of this is production of an abnormal transmembrane protein that is responsible for producing sweat, mucus, and digestive fluids.

Explain in depth the correlation between the defective gene and the abnormal protein that is produced. Be sure to mention the process involved in protein production, whether or not those process(s) have occurred, and their end products. Provide details in your explanation and support your answer with facts from your textbook, research, and articles from scholarly journals.

Pregnancy Questions:

A) Where would you expect to find aromatase in the fetal-placental unit?

Select one:

a. Syncytiotrophoblast cells

b. Cytotrophoblast cells

c. The fetal adrenal glands

d. There is no aromatase expressed in either the placenta or fetus

B) Match the structure with the cells or groups of cells from which it develops.

Structures:

- yolk sac

- amnion

- nervous system

- embryo as a whole

- chorion

Cells/Groups of Cells to choose from:

- Embryonic ectoderm

- Extraembryonic mesoderm and extraembryonic endoderm

- Extraembryonic mesoderm and extraembryonic ectoderm

- Inner cell mass

- Extraembryonic mesoderm and trophoblast cells