Blood and Its Functions

What is the only type of connective tissue with a liquid matrix?

• Bone

• Cartilage

• Blood

• Adipose tissue

Answer explanation

Blood is the only type of connective tissue that has a liquid matrix, known as plasma. This distinguishes it from other connective tissues like bone, cartilage, and adipose tissue, which have solid or gel-like matrices.

What is the primary function of blood in the body?

• Provides structural support

• Transports vital substances and regulates processes for homeostasis

• Stores energy

• Protects against UV radiation

Answer explanation

The primary function of blood is to transport vital substances like oxygen and nutrients, and to regulate processes such as temperature and pH for homeostasis, making this the correct choice.

Tags

NGSS.HS-LS1-3

What percentage of body weight does blood typically constitute?

• 5%

• 8%

• 10%

• 12%

Answer explanation

Blood typically constitutes about 8% of total body weight. This percentage can vary slightly among individuals, but 8% is the standard estimate used in medical contexts.

Where do blood cells primarily form?

• Yellow bone marrow

• Liver

• Red bone marrow

• Spleen

Answer explanation

Blood cells primarily form in red bone marrow, which is responsible for producing red blood cells, white blood cells, and platelets. Yellow bone marrow mainly stores fat and does not play a significant role in blood cell production.

Tags

NGSS.HS-LS1-4

What are the components of blood cells referred to as?

• Liquid elements

• Formed elements

• Structural elements

• Functional elements

Answer explanation

The components of blood cells are referred to as 'formed elements.' This term encompasses the various cellular components, including red blood cells, white blood cells, and platelets, which are crucial for blood function.

What percentage of a centrifuged blood sample is made up of plasma?

• About 55%

• About 45%

• About 35%

• About 25%

Answer explanation

In a centrifuged blood sample, plasma typically constitutes about 55% of the total volume. This makes it the largest component, while the remaining 45% consists of cells and other elements.

Where are red blood cells (RBCs) found in a centrifuged blood sample?

• Top of the centrifuge tube

• Middle of the centrifuge tube

• Bottom of the centrifuge tube

• Evenly distributed throughout the tube

Answer explanation

In a centrifuged blood sample, red blood cells (RBCs) are denser than other components and settle at the bottom of the centrifuge tube, making the correct answer the bottom of the centrifuge tube.

What is the percentage range of red blood cells (RBCs) in females?

• 25 to 36%

• 35 to 46%

• 45 to 56%

• 55 to 66%

Answer explanation

The normal percentage range of red blood cells (RBCs) in females is 35 to 46%. This range reflects healthy levels of hemoglobin and overall blood health.

What is the term used for the percentage of red blood cells in a blood sample?

• Hemoglobin

• Hematocrit

• Plasma

• Buffy coat

Answer explanation

The term 'Hematocrit' refers to the percentage of red blood cells in a blood sample. It is a key measure in assessing blood health, unlike hemoglobin, plasma, or the buffy coat, which refer to different components of blood.

What component of blood makes up less than 1% of the blood volume in a centrifuged sample?

• Plasma

• Red blood cells

• White blood cells and platelets

• Hematocrit

Answer explanation

In a centrifuged blood sample, white blood cells and platelets together make up less than 1% of the total blood volume, while plasma and red blood cells constitute the majority.