What body system is the skeletal system most closely associated with when hematopoiesis happens?

A. Urinary system

B. Digestive system

C. Muscular system

D. Cardiovascular system

Answer Explanation:

The cardiovascular system is closely associated with hematopoiesis because it includes the heart and blood vessels, which are responsible for circulating blood throughout the body. Hematopoiesis, the process of blood cell formation, primarily occurs in the bone marrow, which is part of the skeletal system. However, the cardiovascular system plays a crucial role in transporting these blood cells to various parts of the body once they are produced in the bone marrow.

So, while the skeletal system provides the site for hematopoiesis, the cardiovascular system is responsible for distributing the blood cells, making it the most closely associated system in this context.

Therefore, the Correct Answer is D.

Q #1: An intracellular chemical signal can be produced in the cell membrane. Once it is produced, where does it go?

A. To a different cell

B. To another part of the same cell

C. To a region right outside the cell

D. To an area with a high ion concentration
Answer Explanation

There are two major types of receptor molecules that respond to an intercellular chemical signal:
- Intracellular receptors: These receptors are located in either the cytoplasm or the nucleus of the cell. Signals diffuse across the cell membrane and bind to the receptor sites on intracellular receptors, of the same cell.
- Membrane-bound receptors: These receptors extend across the cell membrane, with their receptor sites on the outer surface of the cell membrane. They respond to intercellular chemical signals that are large, water-soluble molecules that do not diffuse across the cell membrane.
Q #2: What structure plays a role in air conduction?

A. Alveolus

B. Capillary

C. Lung

D. Trachea
Answer Explanation

The primary function of the respiratory system is to provide oxygen to and remove carbon dioxide from the body. In addition to gas exchange, the respiratory system enables a person to breathe. Breathing, or inhalation, is essential to life. It is the mechanism that provides oxygen to the body. Without oxygen, cells are unable to perform their functions necessary to keep the body alive. The primary muscle of inspiration is the diaphragm. Known as the chest cavity, this dome shaped structure flattens when it contracts. The rib cage moves outward, allowing outside air to be drawn into the lungs. During relaxation, the diaphragm returns to its dome shape and the rib cage moves back to its natural position. This causes the chest cavity to push air out of the lungs.

The respiratory system can be functionally divided into two parts:
- Air-conducting portion: Air is delivered to the lungs. This region consists of the upper and lower respiratory tract—specifically, the larynx, trachea, bronchi, and bronchioles.
- Gas exchange portion: Gas exchange takes place between the air and the blood. This portion includes the lungs, alveoli, and capillaries.
Q #3: During the aging process, not all hormone levels decrease; some actually increase. Which of the following is a hormone that may increase as a person ages?

A. Cortisol

B. Insulin

C. Luteinizing

D. Thyroid
Answer Explanation

The aging process affects hormone activity in one of three ways: their secretion can decrease, remain unchanged, or increase.

Hormones that decrease secretion include the following:
- Estrogen (in women)
- Testosterone (in men)
- Growth hormone
- Melatonin
In women, the decline in estrogen levels leads to menopause. In men, testosterone levels usually decrease gradually. Decreased levels of growth hormone may lead to decreased muscle mass and strength. Decreased melatonin levels may play an important role in the loss of normal sleep-wake cycles (circadian rhythms) with aging.

Hormones that usually remain unchanged or slightly decrease include the following:
- Cortisol
- Insulin
- Thyroid hormones
Hormones that may increase secretions levels include the following:

Parathyroid hormone
- Follicle-stimulating hormone (FSH)
- Luteinizing hormone (LH)
- Norepinephrine
- Epinephrine, in the very old

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What body system is the skeletal system most closely associated with when hematopoiesis happens?

More Questions on TEAS 7 Science

Q #1: An intracellular chemical signal can be produced in the cell membrane. Once it is produced, where does it go?

Answer Explanation

Q #2: What structure plays a role in air conduction?

Answer Explanation

Q #3: During the aging process, not all hormone levels decrease; some actually increase. Which of the following is a hormone that may increase as a person ages?

Answer Explanation

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