Question

In: Anatomy and Physiology

Which of the following statements about hemoglobin is false? a. hemoglobin is a very large protein...

Which of the following statements about hemoglobin is false?

	a.	hemoglobin is a very large protein composed of four large protein subunits
	b.	there are two alpha (α) and two beta (β) subunits in each hemoglobin molecule
	c.	each alpha and beta subunit includes a heme group
	d.	oxygen (O₂) molecules bind irreversibly to an iron ion (Fe⁺⁺) in a heme group

Which of the following statements about oxygen delivery to the body tissues is false?

	a.	low oxygen concentration in the body tissues enhances the unbinding of oxygen (O₂) from hemoglobin
	b.	hemoglobin usually loses all four oxygens (O₂) when they unbind in the tissues
	c.	body tissues have greater acidity (higher hydrogen ion (H⁺) concentration (lower pH) than the lungs
	d.	higher acidity (higher hydrogen ion (H⁺) causes hemoglobin to release more oxygen (O₂

Digestion is necessary because…

		large biomolecules cannot pass through cell membranes
		the absorption of food requires energy (is endergonic)
		only monomers are absorbed through the lining of the small intestine
		all except choice (b) are correct

Which of the following is not a type of biomolecule that must be digested before it can be absorbed?

	a.	long-chain carbohydrate molecules
	b.	protein molecules
	c.	nucleic acid molecules
	d.	water-soluble vitamins

Which of the following is not a function of human blood?

	a.	blood transports oxygen and nutrients to all body cells
	b.	blood transports carbon dioxide and other metabolic wastes from cells
	c.	blood helps maintain the body’s internal pH and water concentration
	d.	blood exchanges gases with the atmosphere primarily through the skin

Which of the following statements about human blood is false?

	a.	blood plasma makes up more than half of the volume of normal blood
	b.	blood plasma is mostly water, with dissolved ions, amino acids, glucose, hormones, proteins, and other materials
	c.	white blood cells (leukocytes) make up about 40% of the volume of normal blood
	d.	red blood cells (erythrocytes) are the most common blood cells

Expert Solution

Correct Option: d because it is false-

The reversible nature of the binding of oxygen allows for both the uptake of oxygen in the lungs and its release in body tissues. The heme molecules each contain a single central iron atom and are responsible for giving the red colour to haemoglobin, and thus to the blood as a whole.

Correct-a : beacuse it is wrong

The Bohr Effect refers to the observation that increases in the carbon dioxide partial pressure of blood or decreases in blood pH result in a lower affinity of hemoglobin for oxygen.

Correct-d : Digestion is important for breaking down food into nutrients, which the body uses for energy, growth, and cell repair. Food and drink must be changed into smaller molecules of nutrients before the blood absorbs them and carries them to cells throughout the body.

Correct-d Water soluble vitamins of dietary origin are absorbed predominantly in the small intestine, whereas those synthesized by microbes in the large intestine are absorbed there.

Correct-d blood exchanges gases with the atmosphere primarily through the alveoli of lungs.

Correct-c : Red blood cells make up about 45% of the blood volume. White blood cells make up about one percent and platelets less than one percent. Plasma makes up the rest of the blood.

Sydney Mullin answered 1 year ago

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