WGU C190 Introduction to Biology Exam

Which chamber of the heart has the thickest wall and pumps oxygenated blood to the whole body?

– Right ventricle

– Left ventricle

– Left atrium

– Right atrium

Which artery will bifurcate into the right common carotid and right subclavian arteries?

– Vertebral

– Axillary

– Brachiocephalic

– Basilar

What causes a higher stroke volume?

– Increased preload

– Decreased blood pressure

– Increased afterload

– Decreased heart contractility

Which valve is open during atrial systole?

– Tricuspid valve

– Semilunar valve

– Aortic valve

– Pulmonary valve

From which structure do coronary arteries arise?

– Superior vena cava

– Left ventricle

– Ascending aorta

– Left atrium

What does cardiac output measure?

– Blood pumped by each ventricle in one minute

– Blood pumped into a ventricle in one minute

– Blood pumped out of an atrium in one minute

– Blood pumped into the atria in one minute

During hemostasis, what is the purpose of vascular spasm?

– To slow blood loss

– To increase platelet production

– To release vitamin K

– To produce fibrin

What increases blood pressure?

– Higher blood viscosity

– Decreased blood volume

– Dilated vessel diameter

– Shorter vessel length

Which white blood cells are the least common?

– Monocytes

– Neutrophils

– Eosinophils

– Basophils

What is a function of the upper respiratory tract?

– Warming and humidifying air

– Oxygen absorbing

– Regulation of calcium ions

– Carbon dioxide gas exchange

According to Boyle’s Law, increased lung volume results in:

– Decreased pressure leading to inhalation

– Increased pressure leading to inhalation

– Decreased pressure leading to exhalation

– Increased pressure leading to exhalation

What decreases surface tension in the alveoli?

– Macrophages

– Surfactant

– Pleural fluid

– Mucus

Where does internal respiration occur?

– Between alveoli and blood

– Between cells and blood of systemic capillaries

– Between upper and lower respiratory tract

– Between pulmonary and systemic blood

Which hormone stimulates Na⁺ reabsorption in the kidneys?

– Renin

– Erythropoietin

– Atrial natriuretic peptide

– Aldosterone

What is the purpose of tubular secretion?

– Increase effectiveness of drugs

– Remove excess substances from blood

– Remove pathogens

– Remove 99% of water

Where does filtration begin in the kidney?

– Collecting duct

– Calyx

– Loop of Henle

– Glomerulus

Which phase is part of the ovarian cycle?

– Follicular phase

– Menstrual phase

– Secretory phase

– Proliferative phase

Where does fertilization occur?

– Endometrium

– Ovary

– Uterine tube

– Fimbriae

Which cells produce testosterone?

– Primary spermatocytes

– Sertoli cells

– Spermatids

– Leydig cells

Which structure carries milk to the nipple?

– Lactiferous ducts

– Lymphatic vessels

– Areolar glands

– Ceruminous ducts

Which blood group characteristic is true for B+ blood?

– Rh antigen absent

– B antigen present on RBCs

– O blood can be transfused

– Anti‑B antibodies present

Which cell produces inhibin?

– Sertoli cells

– Spermatids

– Primary spermatocyte

– Secondary spermatocyte

Which cells are polymorphonuclear leukocytes?

– Basophils

– Monocytes

– Eosinophils

– Neutrophils

What is the function of histamine during injury?

– Decrease permeability

– Decrease swelling

– Reduce blood flow

– Dilate blood vessels

Which cell acts on B cells to elicit antibody production?

– Helper T cells

– Cytotoxic T cells

– Mast cells

– Plasma cells

Academic success requires more than effort—it requires the right support. Students choose trusted exam experts for their reliability, discretion, and effectiveness. With guaranteed outcomes, 24/7 availability, and personalized assistance, ProctoredExamsExperts.com removes uncertainty and replaces it with confidence and high performance