Diaphragm action during expiration A. Contracts and curves B. Contracts and flat

Question

Diaphragm action during expiration A. Contracts and curves B. Contracts and flattens C. Relaxes and curves D. Relaxes and flattens Virtually all fats are absorbed A. In the large intestine into blood capillaries B. In the large intestine into lymphatic capillaries C. In the small intestine into blood capillaries D. In the small intestine into lymphatic capillaries Most common extracellular anion A. HCO_3^- B. Cl^- C. K^+ D. Na^+ Chemical protein digestion begins in the A. Mouth B. Small intestine C. Stomach Fertilization normally occurs in A. Cervix B. Fallopian tube C. Uterus D. Vagina Component of blood that is not normally found in lymph A. Electrolytes B. Erythrocytes C. Lymphocytes D. Plasma proteins Primary endocrine hormone secreted by corpus luteum A. Human chorionic gonadotropin B. Luteinizing hormone C. Progesterone D. Testosterone Which two valves close during systole A. Aortic and tricuspid B. Tricuspid and mitral C. Mitral and

Explanation / Answer

Answer:

79). D. Relaxes and flattens

Explanation:

The diaphragm is a naturally curved muscle that sits between the thoracic and abdominal cavities. When it is at rest, it is slightly tense. During inhalation the diaphragm begins to move downwards and flattens, which allows the lungs to expand and accommodate air. This process lowers the air pressure in the lungs, causing lower air pressure. When the pressure in the lungs is lower than atmospheric pressure, air naturally moves inwards.

During expiration, the diaphragm moves to its original position and gradually moves the air outwards. This is a controlled process that increases the air in the lungs to reach a higher pressure than the atmospheric pressure outside, which encourages it to move out.

80). D. in the small intestine into lymphatic capillaries

Explanation:

Lipid breakdown products are absorbed into a lacteal in the villi, and transported via the lymphatic system to the bloodstream.

81). D. Na+

Explanation:

Sodium is the primary cation (positive ion) in extracellular fluids in animals and humans. These fluids, such as blood plasma and extracellular fluids in other tissues, bathe cells and carry out transport functions for nutrients and wastes.

82). C. Stomach

Explanation:

Proteins are digested first in the stomach, where pepsin(released from chief cells) digests some of the proteins.

83). B. Fallopian tube

84). B. Erythrocytes (red blood cells)

Explanation:

The lymph is derived from the interstitial fluid, its composition continually changes as the blood and the surrounding cells continually exchange substances with the interstitial fluid. It is generally similar to blood plasma except that it doesn't contain red blood cells.

85). C. Progesterone

Explanation:

The corpus luteum is essential for establishing and maintaining pregnancy in females. Thecorpus luteum secretes progesterone, which is a steroid hormone responsible for the decidualization of the endometrium (its development) and maintenance, respectively.

86). B. Tricuspid and mitral

Explanation:

During systole, both atrioventricular valves (tricuspid and mitral) are closed. The aortic valve is open.

During diastole, both atrioventricular valves are open, and the aortic valve is closed.

Related Questions

Navigate

• Browse (All)
• Browse D
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.